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<table width="841" border="0" align="center" cellpadding="0" cellspacing="0" id="Tabla_01">
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<td colspan="3" bgcolor="#FFFFFF"><p align="center" class="Estilo5"> </p>
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<p align="center"><a href="ENLACE BORRADO" target="_blank"><img src="images/hosting.gif" alt="Universidad Complutense" width="300" height="50" border="0" /></a><a href="#" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('home','','Images/home2.gif',0)"></a>
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Así te debería funcionar. Fíjate que no habías sustituido lo de la etiqueta IFRAME por el código. lo que habías hecho, es poner dicho código en el HEAD
Básicamente, este script hace lo mismo que el que has encontrado tú.
Pero bueno. Si ya lo has resuelto... pues nada. A funcionar.
Un saludo.