还是内嵌帧的问题!

如果我一个页面里包括有两个内嵌帧,我想用javascript改变form的target来分别把表单提交到这两个内前帧中去,我应该怎么做呢?

1<form action="" method="post" name="form1" target="">
2<iframe name="a"></iframe>
3<iframe name="b"></iframe>
4</form>
 1<script>   
 2<!--   
 3document.form1.target="a";   
 4document.form1.action="url1";   
 5document.form1.submit();   
 6document.form1.target="b";   
 7document.form1.action="url2";   
 8document.form1.submit();   
 9//-->   
10</script>

这样好象不行,为什么呢?我应该怎么做,谢谢!
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1<iframe height="100" name="a" width="200"></iframe>
1<br/>
1<iframe height="100" name="b" width="200"></iframe>
1<form action="" method="post" name="form1" target="">
2<!--Put some input fields here.-->
3</form>
 1<script>   
 2<!--   
 3document.form1.target="a";   
 4document.form1.action="url1";   
 5document.form1.submit();   
 6document.form1.target="b";   
 7document.form1.action="url2";   
 8document.form1.submit();   
 9//if "url1" and "url2" are both variables,do not put them between "".   
10//-->   
11</script>

---------------------------------------------------------------

我的建议是一个iframe对应一个form,他们的name可以动态生成!

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