为什么这样会出错呢？解决办法

为什么这样会出错呢？
<script   src= " "   id= "stat "   > </script>
<script>
var   height=window.screen.height;
var   width=window.screen.width;
var   str= "ip.asp?Resolution= "+width+ "X "+height;
stat.src=str;
</script>


------解决方案--------------------
up