function validateEmailAddress(elementId) {			
	var emailValue = document.getElementById(elementId).value.toLowerCase();
	/* The following variable tells the rest of the function whether or not
	to verify that the address ends in a two-letter country or well-known top-level domain (TLD). 
	1 means check it, 0 means don’t. */
	var checkTLD	= 1;
	/* The following is the list of known TLDs that an e-mail address must end with. */
	var knownDomsPat= /^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	/* The following pattern is used to check if the entered e-mail address
	fits the user@domain format. It also is used to separate the username
	from the domain. */
	var emailPat	= /^(.+)@(.+)$/;
	/* The following string represents the pattern for matching all special	characters. 
	We don’t want to allow special characters in the address.
	These characters include ( ) < > @ , ; : \ ” . [ ] */	
	var specialChars= "\\(\\)><~!@#$%^&*,;:\\\\\\\"\\.\\[\\]";
	/* The following string represents the range of characters allowed in a username or domainname. 
	It really states which chars aren’t allowed.*/
	var validChars	= "\[^\\s" + specialChars + "\]";
	/* The following pattern applies if the “user” is a quoted string 
	(in which case, there are no rules about which characters are allowed and which aren’t; anything goes). 
	*/
	var quotedUser	= "(\"[^\"]*\")";
	/* The following pattern applies for domains that are IP addresses,
	rather than symbolic names. NOTE: The square brackets are required. */
	var ipDomainPat	= /^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	/* The following string represents an atom (basically a series of non-special characters.) */
	var atom		= validChars + '+';
	/* The following string represents one word in the typical username. 	
	Basically, a word is either an atom or quoted string. */
	var word		= "(" + atom + "|" + quotedUser + ")";
	// The following pattern describes the structure of the user
	var userPat		= new RegExp("^" + word + "(\\." + word + ")*$");
	/* The following pattern describes the structure of a normal symbolic domain, 
	as opposed to ipDomainPat, shown above. */
	var domainPat	= new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray	= emailValue.match(emailPat);
	if (matchArray==null) {
		alert("Please enter a valid e-mail address (check @ and .'s).");
		document.getElementById(elementId).focus();
		return false;
	}
	var user	= matchArray[1];					   	
	var domain	= matchArray[2];
	// Start by checking that only basic ASCII characters are in the strings (0-127).
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("Please enter a valid e-mail address, username contains invalid characters.");
			document.getElementById(elementId).focus();
			return false;
		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Please enter a valid e-mail address, domain name contains invalid characters.");
			document.getElementById(elementId).focus();
			return false;
		}
	}
	if (user.match(userPat)==null) {
		alert("Please enter a valid e-mail address.");
		document.getElementById(elementId).focus();
		return false;
	}	
	/* if the e-mail address is at an IP address (as opposed to a symbolic host name) 
	make sure the IP address is valid. */
	var ipArray	= domain.match(ipDomainPat);	
	if (ipArray!=null) {
		for (var i=1;i<=4;i++) {
			if (ipArray[i]>255) {
				alert("Please enter a valid e-mail address, IP address is invalid!");
				document.getElementById(elementId).focus();
				return false;
			}
		}
		//return true;
	} 
	// Domain is symbolic name. Check if it’s valid.
	var atomPat	= new RegExp("^" + atom + "$");
	var domArr	= domain.split(".");
	var len		= domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			alert("Please enter a valid e-mail address, domain name does not seem to be valid.");
			document.getElementById(elementId).focus();
			return false;
		}
	}
	/* domain name seems valid, but now make sure that it ends in a known top-level domain 
	(like com, edu, gov) or a two-letter word, representing country (uk, in), 
	and that there’s a hostname preceding the domain or country. */
	if (checkTLD && domArr[domArr.length-1].length!=2 && 
		domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("Please enter a valid e-mail address, e-mail address must end in a domain name or two letter country code.");										
		document.getElementById(elementId).focus();
		return false;
	}
	// Make sure there’s a host name preceding the domain.
	if (len<2) {
		alert("Please enter a valid e-mail address, e-mail address is missing a hostname!");
		document.getElementById(elementId).focus();
		return false;
	}
    return true;		    	   		
}

function strltrim() {
	return this.replace(/^\s+/,'');
}

function strrtrim() {
	return this.replace(/\s+$/,'');
}

function strtrim() {
	var str = this.replace(/^\s+/,'');
	return str.replace(/\s+$/,'');
}

function strcondense() {
	var str = this.replace(/^\s+/,'');
	var str2 = str.replace(/\s+$/,'');
	return str2.replace(/\s+/g,'');
}

String.prototype.ltrim = strltrim;
String.prototype.rtrim = strrtrim;
String.prototype.trim = strtrim;
String.prototype.condense = strcondense;