<div class="body">
<table class="header1" id="Table_01" width="900" height="228" border="0" cellspacing="0" cellpadding="0">
<tr><td width="23" rowspan="6"> </td>
<td height="38" width="213">
<a href="#" onmouseover="window.status='knowledges'; changeImages('knowledges', 'images/knowledges-over.gif'); return true;"
onmouseout="window.status=''; changeImages('knowledges', 'images/knowledges.gif'); return true;">
<img id="knowledges" src="images/knowledges.gif" border="0" height="38" width="213" alt="Знания"></a></td>
<script type="text/javascript">
function changeImages(ID,Image)
{
if (preloadFlag == true) document.getElementById(ID).src=Image;
}
</script>
Попробуйте так
Надеюсь переменная preloadFlag существует и установлена в true