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<html>
<form id="form">
<input type="checkbox" id="form_checkAll" onpropertychange="onCheckAllChange()" />
<input type="checkbox" id="form_checkOne" />
<input type="checkbox" id="form_checkOne" />
<input type="checkbox" id="form_checkOne" />
</form>
<script>
function onCheckAllChange(){
if(form.form_checkOne.length){
var index;
for(index=0; index<form.form_checkOne.length; index++){
form.form_checkOne[index].checked = form.form_checkAll.checked;
}
} else if("checkbox" == form.form_checkOne.type){
form.form_checkOne.checked =
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