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JavaScript Select all checkboxes

Select all checkboxes

<script>
function ch(a) {
  void(d=document);
  void(input=d.getElementsByTagName('INPUT'));
  for(i=0;i<input.length;i++) void(input[i].checked=a)
}
</script>
<input type=checkbox onclick="if(this.checked){ch(1)}else{ch(0)}">select all<BR>
<input type=checkbox>eg1<BR>
<input type=checkbox>eg2<BR>
<input type=checkbox>eg3