function emailCheck (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("E-mail address seems incorrect (check @ and .'s).");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];

	/*if (user.match(userPat)==null) {
		alert("The username doesn't seem to be valid.");
		return false;
	}*/

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		  for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid in your e-mail address!");
			return false;
			}
		}
		return true;
	}
	
	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		alert("The domain name doesn't seem to be valid in your e-mail address.");
		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>3) {
	   alert("The address must end in a three-letter domain, or two letter country.");
	   return false;
	}
	
	if (len<2) {
	   var errStr="This address is missing a hostname!";
	   alert(errStr);
	   return false;
	}

	return true;
}

function isNum(CurrentValue)
{
	var Length = CurrentValue.length;

	for(var j = 0; j < Length; j++)
	{
		ch = CurrentValue.charAt(j);
		if(ch < "0" || ch > "9")
			return false;
	}
	return true;
}	

function Trim (theString)
{//removes spaces at the beginning and end of text
	if ((theString != null) && (theString.length > 0))
	{
		for (var cFirstCharacter = 0; (cFirstCharacter < theString.length) && (theString.charAt(cFirstCharacter) == ' '); cFirstCharacter++)
			;

		for (var cLastCharacter = theString.length-1; (cLastCharacter > 0) && (theString.charAt(cLastCharacter) == ' '); cLastCharacter--)
			;

		if (cFirstCharacter <= cLastCharacter)
			theString = theString.substring(cFirstCharacter, cLastCharacter+1);
		else
			theString = '';
		}

	return theString;
}