<input type="checkbox" id="zhz[]" onclick="Btn_click()" />1<br/>
<input type="checkbox" id="zhz[]" onclick="Btn_click()" />2<br/>
<input type="checkbox" id="zhz[]" onclick="Btn_click()" />3<br/>
<input type="checkbox" id="zhz[]" onclick="Btn_click()" />4<br/>
<input type="checkbox" id="zhz[]" onclick="Btn_click()" />5<br/>
<input type='checkbox' onclick="CheckAll(this.form.elements['zhz[]'], this.checked)" />Check/UnCheck All
</form>
<script language='javascript'>
<!--
function CheckAll(srcElem, do_check){
if(typeof(srcElem)=='undefined') return;
var cnt = (typeof(srcElem.length)!='undefined')? srcElem.length : 0;
if(cnt){
for(var i=0;i<cnt; i++)
srcElem[i].checked = do_check;
}else
srcElem.checked = do_check;
}
//-->
</script>
http://www.corange.cn/archives/2008/02/252.html
