function validEmail(emailAddress){
	emailAddressValue=emailAddress.value.toLowerCase();
	var countryTLDs=/^(ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cat|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)$/;
	var gTLDs=/^(aero|biz|cat|com|coop|edu|gov|info|int|mil|museum|name|net|org|jobs)$/;
	var basicAddress=/^(.+)@(.+)$/;
	var specialChars='\\(\\)><@,;:\\\\\\\"\\.\\[\\]';
	var validChars='\[^\\s'+specialChars+'\]';
	var validCharset='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\'-_.';
	var quotedUser='(\"[^\"]*\")';
	var atom=validChars+'+';
	var word='('+atom+'|'+quotedUser+')';
	var validUser=new RegExp('^'+word+'(\.'+word+')*$');
	var symDomain=new RegExp('^'+atom+'(\.'+atom+')*$');
	var matchArray=emailAddressValue.match(basicAddress);
	if(emailAddress.value==''||emailAddress==null){
		return true;
	}
	if(matchArray==null){
		alert('The Email address doesn\'t seem to be correct,\nplease check syntax.');
		emailAddress.focus();
		return false;
	}else{
		var user=matchArray[1];
		var domain=matchArray[2];
	for(i=0;i<user.length;i++){
		if(validCharset.indexOf(user.charAt(i))==-1){
			alert('The Email address contains invalid characters,\nplease check the username.');
			emailAddress.focus();
			return false;
		}
	}
	for(i=0;i<domain.length;i++){
		if(validCharset.indexOf(domain.charAt(i))==-1){
			alert('The Email address contains invalid characters,\nplease check the domain.');
			emailAddress.focus();
			return false;
		}
	}
	if(user.match(validUser)==null){
		alert('The Email address doesn\'t seem to be correct,\nplease check the username.');
		emailAddress.focus();
		return false;
	}
	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('The Email address doesn\'t seem to be correct,\nplease check the domain name.');
			emailAddress.focus();
			return false;
		}
	}
	if((domArr[domArr.length-1].length==2)&&(domArr[domArr.length-1].search(countryTLDs)==-1)){
		alert('The Email address doesn\'t seem to be correct,\nplease check domain suffix.');
		emailAddress.focus();
		return false;
	}
	if((domArr[domArr.length-1].length>2)&&(domArr[domArr.length-1].search(gTLDs)==-1)){
		alert('The Email address doesn\'t seem to be correct,\nplease check domain suffix.');
		emailAddress.focus();
		return false;
	}
	if((domArr[domArr.length-1].length<2)||(domArr[domArr.length-1].length>6)){
		alert('The Email address doesn\'t seem to be correct,\nplease check domain suffix.');
		emailAddress.focus();
		return false;
	}
	if(len<2){
		alert('The Email address doesn\'t seem to be correct,\nplease check missing hostname.');
		emailAddress.focus();
		return false;
	}
	}
	return true;
}


function mandatoryText(input,fieldName){
	if(input.value.trim()==''||input==null){
		alert('Please enter your '+fieldName+'.');
		input.focus();
	return false;
	} else {
	return true;
	}
}



function RIFvalid(thisform) {
	with (thisform)	{		
		if(!mandatoryText(document.getElementById('emailAddress'), 'Email Address')) return;
		if(!validEmail(document.getElementById('emailAddress'))) return;
		//if(validate_required(EMAIL_FIELD, "Please enter a valid email address.")) return;
		//if (validate_required(email,"Please enter a valid email address.")==false){email.focus();return false;}
	}
}