<script language="JavaScript">
function hideit(w){
eval("document.all."+w+".style.display='none';");
}
</script>
<div id="aid" name="aid">this is a div</div>
<input type="button" onclick="hideit('aid')" value="hide">
function hideit(w){
eval("document.all."+w+".style.display='none';");
}
</script>
<div id="aid" name="aid">this is a div</div>
<input type="button" onclick="hideit('aid')" value="hide">
调用函数时括号中要加引号