<script language="javascript" type="text/javascript">
function chg (){
if(document.getElementById("mydiv").style.display=="none"){
document.getElementById("mydiv").style.display="";
}
}
</script>
<input type="button" value="评论" onclick="chg()">
<div id="mydiv" style="display:none;">
<form id="myform" >
<input type="textbox" id="pinlun" >
<input type="submit" id="sbmt" value="提交" >
</form>
</div>
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