function validEmail(email) {
	invalidChars = " /:,;"
	if (email == "") {
		return false
	}
	for (i=0; i<invalidChars.length; i++) {
		badChar = invalidChars.charAt(i)
		if (email.indexOf(badChar,0) != -1) {
			return false
		}
	}
	atPos = email.indexOf("@",1)
	if (atPos == -1) {
		return false
	}
	if (email.indexOf("@",atPos+1) != -1) {
		return false
	}
	periodPos = email.indexOf(".",atPos)
	if (periodPos == -1) {
		return false
	}
	if (periodPos+3 > email.length)	{
		return false
	}
	return true
}


function checksurvey(form) {
	if (!validEmail(form.email.value)) {
		alert("Invalid email address")
		form.email.focus()
		form.email.select()
		return false
	}
	if (form.likely[0].checked == false && form.likely[1].checked == false && form.likely[2].checked == false && form.likely[3].checked == false) {
		alert("Please indicate how likely you are to purchase an on-line chess subscription.\n");
		form.likely[2].focus();
		form.likely[2].click();
		return false;
	}
	if (form.pay[0].checked == false && form.pay[1].checked == false && form.pay[2].checked == false) {
		alert("Please let us know your price expectations for an on-line chess subscription.\n");
		form.pay[1].focus();
		form.pay[1].click();
		return false;
	}
	if (form.purchase[0].checked == false && form.purchase[1].checked == false && form.purchase[2].checked == false && form.purchase[3].checked == false) {
		alert("Please indicate how likely you are to purchase a 3D on-line chess\nsubscription in your preferred price range.\n");
		form.purchase[2].focus();
		form.purchase[2].click();
		return false;
	}
	if (form.threed[0].checked == false && form.threed[1].checked == false) {
		alert("Please indicate how much a 3D on-line chess experience means to you.\n");
		form.threed[0].focus();
		form.threed[0].click();
		return false;
	}

	if (form.single.value.length<5) {
		alert("Please tell us your single preferred feature.\n");
		form.single.focus();
		return false;

	}
	return true;
}