求大神指教下JS， src="string"错了怎么改呀

<script>
var ID=document.getElementById("TextBox1").value;
var string="http://hq.sinajs.cn/list="+ID;
</script>
<script type="text/javascript" src="string" charset="gb2312"></script>
<script>
var s="hq_str_"+ID;
var elements=s.split(",");
document.write("current price:"+elements[3]);
</script>