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If you would like to show a javascript alert if no checkbox was checked in a form, you need to validate the checked property of that checkbox. By using the onSubmit event of the form and a JS function similar to the example below you can validate your form correctly.

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Example code
<SCRIPT TYPE="text/javascript" LANGUAGE=JAVASCRIPT>
<!--
//------------------------------------------/
// Code from http://www.NetEvolution.co.uk
//------------------------------------------/
function checkCheckBoxes() {
	if (document.frmTest.CHKBOX_1.checked == false &&
	    document.frmTest.CHKBOX_2.checked == false &&
	    document.frmTest.CHKBOX_3.checked == false)
		{
		alert ('You didn\'t choose any of the checkboxes!');
		return false;
		}
	else
		{
		return true;
		}
	}
//-->
</SCRIPT>


<form onsubmit="return checkCheckBoxes();" action="">
<input type="checkbox" name="CHKBOX_1" value="1">1</p>
<input type="checkbox" name="CHKBOX_2" value="2">2</p>
<input type="checkbox" name="CHKBOX_3" value="3">3</p>
<input type="submit" value="Submit!" />
</form>



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