下拉框与表单提交问题,急急急,在线等待

如何使下拉框一变,就提交一次表单,我的第一次改变可以提交,然后再改变就不再提交了,我需要每次改变都提交,请高手帮忙。
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 1<body>
 2<script>   
 3var s=true   
 4</script>
 5<form action="next.asp" method="post" name="form1" target="_blank">
 6<select name="select1" onchange="if(s){document.all.form1.submit();s=false}">
 7<option value="1">1   
 8<option value="2">2   
 9</option></option></select>
10</form>
11</body>
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