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        <script type="text/javascript">
                function onSub(){
                    //±íµ¥ÑéÖ¤´úÂë
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          <input type="button" name="button" id="button" onclick="javascript:onSub();" />
         <img src="ͼƬ·¾¶" onclick="javascript:onSub();" />
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       function butOnClick() {
            if (event.keyCode == 13) {
                 var button = document.getElementById("bsubmit");  //bsubmit Ϊbotton°´Å¥µÄid
                  button.click();
                  return false;
            }
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