function verifyEmailFormat() {
	f = document.emailsubmit;
	if	(validEmail(f.email.value) != true) {
		return false;
	}
	else {
		document.forms.emailsubmit.submit();
	}
}

//---------------------------------------------------------------------------
// Function: validEmail
// Description: Determines whether an email address is in valid format (x@x.xxx)
// Inputs: email - email address to check
// Return Value: true if valid, else false
//---------------------------------------------------------------------------
function validEmail(emailStr) {
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) {
		alert('The email address you entered is invalid. Example of valid email address: username@domain.com');
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null) {
		alert('The email address you entered is invalid. Example of valid email address: username@domain.com');
		return false;
	}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
			alert('The email address you entered is invalid. Example of valid email address: username@domain.com');
			return false;
			}
		}
		return true;
	}
	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		alert('The email address you entered is invalid. Example of valid email address: username@domain.com');
		return false;
	}
	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>4) {
		alert('The email address you entered is invalid. Example of valid email address: username@domain.com');
		return false;
	}
	if (len<2) {
		var errStr="This address is missing a hostname!";
		alert('The email address you entered is invalid. Example of valid email address: username@domain.com');
		return false;
	}
	return true;
}