Form validation

<script language="JavaScript" type="text/javascript">
 
    function formCheck() {
    	var score = 0; var needed = 0;
    	needed++; if (document.forms[0].code.value != '') score++;
    	needed++; if (document.forms[0].email.value != '') score++;
 
        var radiotest = 0; var radiopass = 0;
        for (i=0; i<document.forms[0].elements.length; i++) {
            currElem = document.forms[0].elements[i];
            if (currElem.type == "radio") radiotest = 1;
            if (currElem.type == "radio" && currElem.checked) radiopass = 1;
        }
        needed = needed + radiotest;
        score = score + radiopass;
 
    	if (score == needed) return true;
    	else {
    		alert('Please complete all forms'); 
            return false;
    	}
    }
</script>
 
 
<form action="test.php" method="post" onSubmit="return formCheck();">