<div id="xxx">hello world</div>
<script language="javascript">
var xid = "xxx";
obj = eval("document.all." + xid);
alert(obj.innerHTML);
</script>
<script language="javascript">
var xid = "xxx";
obj = eval("document.all." + xid);
alert(obj.innerHTML);
</script>
var a="a";
eval(a+"='b'");
alert(a);