Html Checkbox...is there anyone to help me...

i am new to html..
i wowuld like to kno how i can select all checkboxes and deselect all the checkboxes at one click ..
i mean iwould like to kno how the delete all option in yahoo mail page works....
i dont want to run javascripts like thing.
please give me the syntax....

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<script language="JavaScript">
function selAll()
     var i;
     var len=document.frm.chkbox.length;
     for(i=0; i<len; i++)
          document.frm.chkbox.checked=true;
</script>
</head>
<body>
<form name=frm>
Select All <input type="Checkbox" name="selall" onclick="selAll()"><br>
A <input type="Checkbox" name="chkbox"><br>
B <input type="Checkbox" name="chkbox"><br>
C <input type="Checkbox" name="chkbox"><br>
D <input type="Checkbox" name="chkbox">
</form>
</body>
</html>

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