I have tried to replicate your setup. I had none of the problems you have. The only difference between our setups was that I use IE8.
Then I remembered that IE6 has a lot of problems working with xhtml. Allthough your fallback doctype is HTML4, the MinimalExtropy skin is written for XHTML 1.0 Transitional (look in those .doctype.xml files, you will see how the skin overrides the fallback skin type).
If you want your website to perform well on IE6, you may have to use only skins that use the HTML 4 doctype. There are still a lot of those skins around for free download. Actually, most skins that are on offer for free are HTML 4 type skins.
Upgrade your IE to IE8 and see what happens.
The version of DSL you are using (I expect that to be 3.0.5) has a problem that will be solved in 3.0.6, to be released soon now. To avoid extra problems and extra requests for support, copy the text between the cut lines, copy/past it in notepad and save the file as Delisoft.DSLocalizator.dnn and replace the file with this name in your DSL setup package. Then setup DSL.
-----cut-------
<dotnetnuke type="Package" version="5.0">
<packages>
<package name="Delisoft - DSTabLocalizator" type="Module" version="3.0.5">
<friendlyName>Delisoft - TabLocalizator Admin</friendlyName>
<description>Complete Localizator for DNN 5x. Also, stores viewstate in SQL storage, optimizes the preview mode for intranets and helps preventing session expiration</description>
<owner>
<name>Locopon</name>
<organization>Delisoft</organization>
<url>http://dnn.tiendaboliviana.com</url>
<email />
</owner>
<license>The license for this package is not currently included within the installation file, please check with the vendor for full license details.</license>
<releaseNotes />
<components>
<component type="Script">
<scripts>
<basePath>DesktopModules\Delisoft.DSLocalizator</basePath>
<script type="Install">
<name>01.00.00.SqlDataProvider</name>
<version>01.00.00</version>
</script>
<script type="Install">
<name>01.00.01.SqlDataProvider</name>
<version>01.00.01</version>
</script>
<script type="Install">
<name>01.00.02.SqlDataProvider</name>
<version>01.00.02</version>
</script>
<script type="Install">
<name>01.00.03.SqlDataProvider</name>
<version>01.00.03</version>
</script>
<script type="Install">
<name>01.00.04.SqlDataProvider</name>
<version>01.00.04</version>
</script>
<script type="Install">
<name>01.00.05.SqlDataProvider</name>
<version>01.00.05</version>
</script>
<script type="Install">
<name>01.00.06.SqlDataProvider</name>
<version>01.00.06</version>
</script>
<script type="Install">
<name>01.00.07.SqlDataProvider</name>
<version>01.00.07</version>
</script>
<script type="Install">
<name>01.00.08.SqlDataProvider</name>
<version>01.00.08</version>
</script>
<script type="Install">
<name>01.00.09.SqlDataProvider</name>
<version>01.00.09</version>
</script>
<script type="Install">
<name>01.00.10.SqlDataProvider</name>
<version>01.00.10</version>
</script>
<script type="Install">
<name>01.00.11.SqlDataProvider</name>
<version>01.00.11</version>
</script>
<script type="Install">
<name>01.00.12.SqlDataProvider</name>
<version>01.00.12</version>
</script>
<script type="Install">
<name>01.00.13.SqlDataProvider</name>
<version>01.00.13</version>
</script>
<script type="Install">
<name>01.00.14.SqlDataProvider</name>
<version>01.00.14</version>
</script>
<script type="Install">
<name>01.00.15.SqlDataProvider</name>
<version>01.00.15</version>
</script>
<script type="Install">
<name>01.00.16.SqlDataProvider</name>
<version>01.00.16</version>
</script>
<script type="Install">
<name>01.00.17.SqlDataProvider</name>
<version>01.00.17</version>
</script>
<script type="Install">
<name>01.00.18.SqlDataProvider</name>
<version>01.00.18</version>
</script>
<script type="Install">
<name>01.00.19.SqlDataProvider</name>
<version>01.00.19</version>
</script>
<script type="Install">
<name>01.00.20.SqlDataProvider</name>
<version>01.00.20</version>
</script>
<script type="Install">
<name>01.00.21.SqlDataProvider</name>
<version>01.00.21</version>
</script>
<script type="Install">
<name>01.00.22.SqlDataProvider</name>
<version>01.00.22</version>
</script>
<script type="Install">
<name>01.00.23.SqlDataProvider</name>
<version>01.00.23</version>
</script>
<script type="Install">
<name>01.00.24.SqlDataProvider</name>
<version>01.00.24</version>
</script>
<script type="Install">
<name>01.00.25.SqlDataProvider</name>
<version>01.00.25</version>
</script>
<script type="UnInstall">
<name>Uninstall.SqlDataProvider</name>
<version>3.0.5</version>
</script>
</scripts>
</component>
<component type="Module">
<desktopModule>
<moduleName>Delisoft - DSTabLocalizator</moduleName>
<foldername>Delisoft.DSLocalizator</foldername>
<businessControllerClass>Delisoft.DNN.Modules.DSLocalizator.Business.TabLocalization_OptionsController, Delisoft.DNN.Modules.DSLocalizator</businessControllerClass>
<supportedFeatures>
<supportedFeature type="Portable" />
<supportedFeature type="Searchable" />
</supportedFeatures>
<moduleDefinitions>
<moduleDefinition>
<friendlyName>DSTabLocalizator</friendlyName>
<defaultCacheTime>0</defaultCacheTime>
<moduleControls>
<moduleControl>
<controlKey />
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSTabLocalizator.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSTabLocalizator</controlTitle>
<controlType>View</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>GeneralOptions</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSLocalizatorOptions.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocalizator - General Options</controlTitle>
<controlType>Admin</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>IncludeFiles</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSFileIncluder.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocalizator - Include Files</controlTitle>
<controlType>Admin</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>ModuleLocalization</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSTabLocalizatorModules.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocalizator - Module Localization</controlTitle>
<controlType>Admin</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>PortalSettingsLocalization</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSTabLocalizatorPortals.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocalizator - Portal Settings Localization</controlTitle>
<controlType>Admin</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>Replacements</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSLocalizatorReplacements.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocalizator - Localized replacements</controlTitle>
<controlType>Admin</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>TabLocalization</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSTabLocalizatorTabs.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocalizator - Tab Localization</controlTitle>
<controlType>Admin</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
</moduleControls>
</moduleDefinition>
</moduleDefinitions>
</desktopModule>
<eventMessage>
<processorType>DotNetNuke.Entities.Modules.EventMessageProcessor, DotNetNuke</processorType>
<processorCommand>UpgradeModule</processorCommand>
<attributes>
<businessControllerClass>Delisoft.DNN.Modules.DSLocalizator.Business.TabLocalization_OptionsController, Delisoft.DNN.Modules.DSLocalizator</businessControllerClass>
<desktopModuleID>[DESKTOPMODULEID]</desktopModuleID>
<upgradeVersionsList>01.00.00,01.00.01,01.00.02,01.00.03,01.00.04,01.00.05,01.00.06,01.00.07,01.00.08,01.00.09,01.00.10,01.00.11,01.00.12,01.00.13,01.00.14,01.00.15,01.00.16,01.00.17,01.00.18,01.00.19,01.00.20,01.00.21,01.00.22,01.00.23,01.00.24,01.00.25</upgradeVersionsList>
</attributes>
</eventMessage>
</component>
<component type="File">
<files>
<basePath>DesktopModules/Delisoft.DSLocalizator</basePath>
<file>
<path>App_LocalResources</path>
<name>DSFileIncluder.ascx.resx</name>
<sourceFileName>DSFileIncluder.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSLocalizatorHostOptions.ascx.resx</name>
<sourceFileName>DSLocalizatorHostOptions.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSLocalizatorInstallHelper.ascx.resx</name>
<sourceFileName>DSLocalizatorInstallHelper.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSLocalizatorOptions.ascx.resx</name>
<sourceFileName>DSLocalizatorOptions.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSLocalizatorReplacements.ascx.resx</name>
<sourceFileName>DSLocalizatorReplacements.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSTabLocalizator.ascx.resx</name>
<sourceFileName>DSTabLocalizator.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSTabLocalizatorModules.ascx.resx</name>
<sourceFileName>DSTabLocalizatorModules.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSTabLocalizatorPortals.ascx.resx</name>
<sourceFileName>DSTabLocalizatorPortals.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSTabLocalizatorTabs.ascx.resx</name>
<sourceFileName>DSTabLocalizatorTabs.ascx.resx</sourceFileName>
</file>
<file>
<path>DSControls</path>
<name>DSTraslator.ascx</name>
<sourceFileName>DSTraslator.ascx</sourceFileName>
</file>
<file>
<path>DSControls</path>
<name>skincontrol.ascx</name>
<sourceFileName>skincontrol.ascx</sourceFileName>
</file>
<file>
<path>DSControls</path>
<name>urlcontrol.ascx</name>
<sourceFileName>urlcontrol.ascx</sourceFileName>
</file>
<file>
<name>DSFileIncluder.ascx</name>
</file>
<file>
<name>DSLClientHelper.js</name>
</file>
<file>
<name>DSLocalizatorHostOptions.ascx</name>
</file>
<file>
<name>DSLocalizatorInstallHelper.ascx</name>
</file>
<file>
<name>DSLocalizatorOptions.ascx</name>
</file>
<file>
<name>DSLocalizatorReplacements.ascx</name>
</file>
<file>
<name>DSTabLocalizator.ascx</name>
</file>
<file>
<name>DSTabLocalizatorModules.ascx</name>
</file>
<file>
<name>DSTabLocalizatorPortals.ascx</name>
</file>
<file>
<name>DSTabLocalizatorTabs.ascx</name>
</file>
<file>
<name>module.css</name>
</file>
</files>
</component>
<component type="ResourceFile">
<resourceFiles>
<basePath>DesktopModules\Delisoft.DSLocalizator</basePath>
<resourceFile>
<name>resources.zip</name>
</resourceFile>
</resourceFiles>
</component>
<component type="Assembly">
<assemblies>
<assembly>
<path>bin</path>
<name>Delisoft.DNN.Modules.DSLocalizator.dll</name>
<version>3.0.5</version>
<sourceFileName>Delisoft.DNN.Modules.DSLocalizator.dll</sourceFileName>
</assembly>
<assembly>
<path>bin</path>
<name>Delisoft.DNN.Modules.DSLocalizator.SqlDataProvider.dll</name>
<version>3.0.6</version>
<sourceFileName>Delisoft.DNN.Modules.DSLocalizator.SqlDataProvider.dll</sourceFileName>
</assembly>
</assemblies>
</component>
</components>
</package>
<package name="Delisoft - DSLocaleSelectorPA" type="Module" version="3.0.5">
<friendlyName>Delisoft - LocaleSelector</friendlyName>
<description>Locale selector module for DNN5X</description>
<owner>
<name>Locopon</name>
<organization>Delisoft</organization>
<url>http://dnn.tiendaboliviana.com</url>
<email />
</owner>
<license>The license for this package is not currently included within the installation file, please check with the vendor for full license details.</license>
<releaseNotes />
<components>
<component type="Module">
<desktopModule>
<moduleName>Delisoft - DSLocaleSelectorPA</moduleName>
<foldername>Delisoft.DSLocalizator</foldername>
<businessControllerClass />
<supportedFeatures />
<moduleDefinitions>
<moduleDefinition>
<friendlyName>DSLocaleSelectorPA</friendlyName>
<defaultCacheTime>0</defaultCacheTime>
<moduleControls>
<moduleControl>
<controlKey />
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSLocaleSelectorPA.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocaleSelectorPA</controlTitle>
<controlType>View</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
<moduleControl>
<controlKey>LocaleSelectorOptions</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSLocaleSelectorPAOptions.ascx</controlSrc>
<supportsPartialRendering>False</supportsPartialRendering>
<controlTitle>DSLocaleSelectorPA</controlTitle>
<controlType>Edit</controlType>
<iconFile />
<helpUrl>http://dnn.tiendaboliviana.com</helpUrl>
<viewOrder>0</viewOrder>
</moduleControl>
</moduleControls>
</moduleDefinition>
</moduleDefinitions>
</desktopModule>
</component>
<component type="File">
<files>
<basePath>DesktopModules\Delisoft.DSLocalizator</basePath>
<file>
<path>App_LocalResources</path>
<name>DSLocaleSelectorPA.ascx.resx</name>
<sourceFileName>DSLocaleSelectorPA.ascx.resx</sourceFileName>
</file>
<file>
<path>App_LocalResources</path>
<name>DSLocaleSelectorPAOptions.ascx.resx</name>
<sourceFileName>DSLocaleSelectorPAOptions.ascx.resx</sourceFileName>
</file>
<file>
<name>DSLocaleSelectorPA.ascx</name>
</file>
<file>
<name>DSLocaleSelectorPA.ascx.resx</name>
</file>
<file>
<name>DSLocaleSelectorPA.css</name>
</file>
<file>
<name>DSLocaleSelectorPAOptions.ascx</name>
</file>
</files>
</component>
</components>
</package>
<package name="DSSkinObjects" type="SkinObject" version="3.0.5">
<friendlyName>Delisoft - skin objects</friendlyName>
<description>SkinObjects for use with DSLocalizator 3.0.5 on DNN 5.02+</description>
<owner>
<name>Locopon</name>
<organization>Delisoft</organization>
<url>http://dnn.tiendaboliviana.com</url>
<email />
</owner>
<license>The license for this package is not currently included within the installation file, please check with the vendor for full license details.</license>
<releaseNotes />
<components>
<component type="SkinObject">
<moduleControl>
<controlKey>DSLOCALESELECTOR</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSLocaleSelector.ascx</controlSrc>
</moduleControl>
</component>
<component type="SkinObject">
<moduleControl>
<controlKey>DSPREVIEWACTIVATOR</controlKey>
<controlSrc>DesktopModules/Delisoft.DSLocalizator/DSPreviewActivator.ascx
</controlSrc>
</moduleControl>
</component>
<component type="File">
<files>
<file>
<name>DSLocaleSelector.ascx</name>
</file>
<file>
<path>App_LocalResources</path>
<name>DSLocaleSelector.ascx.resx</name>
<sourceFileName>DSLocaleSelector.ascx.resx</sourceFileName>
</file>
<file>
<name>DSPreviewActivator.ascx</name>
</file>
<file>
<path>App_LocalResources</path>
<name>DSPreviewActivator.ascx.resx</name>
<sourceFileName>DSPreviewActivator.ascx.resx</sourceFileName>
</file>
</files>
</component>
</components>
</package>
</packages>
</dotnetnuke>
-----cut-------
Then download the sample skin from tiendaboliviana, that is a HTML 4 skin. That should work on IE6 without issues