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新手求助!!

请问各位高手,怎样将listbox里的选项链接的页面显示在frame里啊?
这是我的code:
<head>
<script>
function link(){
       var myindex=document.myform.info.selectedIndex
              location=document.myform.info[myindex].value;
}
</scipt>
</head>
<body>
<form name="myform">
<select name="info">
<option value="">-Market Info-</option>
<option value="">Top30 Volumn</option>
<option value="test1.htm">Top10 Gainers</option>
<option value="test2.htm">Top10 Losers</option>
<option value="test3.htm">Time and Sales</option>
<option value="test.htm">Trade Summary</option>
</select>
<a href="javascript:link()" target="view_main" onMouseOver="self.status='';return true" onMouseOut="self.status='';return true">
<img src="image/go.gif" border=0></a>
</form>
</body>

这个code有bug,我的view_main是main fram in the main page, option box in the right frame of the main page. 我想在点击"go.gif"后,可以将选项链接的页面显示在
view_main里,可以帮帮我吗?
不胜感激!!!