Christian,
Please open ChatUI_IMMain.xml file and remove the following code:
<HtmlMenuItem Text="$UI_MENU_Contacts">
<HtmlMenuItem Text="$UI_MENU_AddContact" Image="Images/icon_add.gif">
<Scripts>
<OnClick>
ChatUI_ShowAddContact();
</OnClick>
</Scripts>
</HtmlMenuItem>
<HtmlMenuItem Text="-" />
</HtmlMenuItem>
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asp wysiwyg html editor: http://cutesoft.net/ASP
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