<form onsubmit="aa(this);">
<input type="text" name="" value="test" /><input type="submit" value="提交" />
</form>
<iframe src="" name="fa" frameborder="1" scrolling="no"></iframe>
<iframe src="" name="fb" frameborder="1" scrolling="no"></iframe>
<script type="text/javascript">
function aa(oform){
oform.action="http://bbs.51js.com";
oform.target="fa"
oform.submit();
oform.action="http://www.iecn.net/bbs/";
oform.target="fb"
oform.submit();
return false;
}
</script>