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This is my code. I like to call same function for both section to check different section
[HTML]function Checkall(form){
for (var i = 1; i < form.elements.length; i++){
eval("form.elements[" + i + "].checked = true");
}
}
<body>
<form name="frm" method="post" action="" onsubmit="chk(this)">
<input type="checkbox" name="on" onClick="Checkall(frm);" />book<br />
<input type="checkbox" name="c[]" value="1" /> checkbox 1<br />
<input type="checkbox" name="c[]" value="2" /> checkbox 2<br />
<input type="checkbox" name="c[]" value="3" /> checkbox 3<br />
<input type="checkbox" name="c[]" value="4" /> checkbox 4<br />
<input type="checkbox" name="c[]" value="5" /> checkbox 5<br /> <br />
<input type="checkbox" name="un" onClick="Checkall(frm);" />food<br />
<input type="checkbox" name="f[]" value="1" /> checkbox 1<br />
<input type="checkbox" name="f[]" value="2" /> checkbox 2<br />
<input type="checkbox" name="f[]" value="3" /> checkbox 3<br />
<input type="checkbox" name="f[]" value="4" /> checkbox 4<br />
<input type="checkbox" name="f[]" value="5" /> checkbox 5<br />
<!--<input type="submit" value="submit" /> -->
</form>
</body>[/HTML]
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