event.srcElement+表格应用

答案：<script language="JavaScript1.2"> 
function changeto(highlightcolor){ 
source=event.srcElement 
if (source.tagName=="TR"||source.tagName=="TABLE") 
return 
while(source.tagName!="TD") 
source=source.parentElement 
if (source.style.backgroundColor!=highlightcolor&&source.id!="ignore") 
source.style.backgroundColor=highlightcolor 
} 

function changeback(originalcolor){ 
if (event.fromElement.contains(event.toElement)||source.contains(event.toElement)||source.id=="ignore") 
return 
if (event.toElement!=source) 
source.style.backgroundColor=originalcolor 
} 
</script> 
<table onMouseOver="changeto('white')" onMouseOut="changeback('#999999')">

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