function checkform(){
		if (document.contactform.name.value == ""){
		alert("Please enter your name.");
		document.contactform.name.focus();
		return false;
		}
		if (document.contactform.zip.value == ""){
		alert("Please enter your Zip Code.");
		document.contactform.zip.focus();
		return false;
		}
		if (document.contactform.phone.value == ""){
		alert("Please enter your telephone number.");
		document.contactform.phone.focus();
		return false;
		}
		if (document.contactform.email.value == ""){
		alert("Please enter your email address.");
		document.contactform.email.focus();
		return false;
		} // Next checks quality of email address
		if (document.contactform.email.value.indexOf("@") == "-1" ||  // Is @ symbol absent?
		document.contactform.email.value.indexOf(".") == "-1"){  // Is period absent?
		alert ("Please enter a valid e-mail address.\nA valid address must include @ and .");
		document.contactform.email.focus();
		return false;
		}
		else
		return true;
		}