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This page is not Valid XHTML 1.0 Transitional!

Below are the results of attempting to parse this document with an SGML parser.

1. Line 39, column 34: there is no attribute "onMouseOver" (explain...).
<a href="index.shtml" onMouseOver="image1.src='home_aktiv.gif';" onMouseOut="ima

2. Line 39, column 76: there is no attribute "onMouseOut" (explain...).
...image1.src='home_aktiv.gif';" onMouseOut="image1.src='home_passiv.gif';">

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"there is no attribute 'FOO' for this element (in this HTML version)"
You have used an attribute with an element that is defined not to have that attribute. This is most commonly caused by using vendor-specific attributes without setting the document type appropriately.