<script language="JavaScript">
<!--
function CheckAll(chk) {
for (var i=0;i<chk.length;i++) chk[i].checked=true;
}
//-->
</script>
<input type="button" value="全" onclick="CheckAll(form.selAnnounce)"><input type='submit' value='删'>
````````````````这个是checkbox的name
全选删除特效
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