如何同时提交多个表单？

1<form id="form1">   
2....   
3</form>

1<form id="form2">   
2....   
3</form>

1<div style="display:none;">
2<iframe name="form1targetwin"></iframe>
3<iframe name="form2targetwin"></iframe>
4</div>

1<button onclick="submit_forms();">提交</button>

 1<script language="JavaScript">   
 2<!--   
 3function submit_forms()   
 4{   
 5form1.target="form1targetwin"   
 6form1.submit();   
 7  
 8form2.target="form2targetwin"   
 9form2.submit();   
10}   
11//-->   
12</script>