function isEmail(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|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|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|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)$/;
	var gTLDs=/^(aero|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|jobs)$/;
	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+'$');
			var domArr=domain.split('.');
			var len=domArr.length;
			for(i=0;i<len;i++){
				if(domArr[i].search(atomPat)==-1){
					alert('The Email address doesn\'t seem to be correct,\nplease check the domain name.');
					emailAddress.focus();
					return false;
				}
			}
			if((domArr[domArr.length-1].length==2)&&(domArr[domArr.length-1].search(countryTLDs)==-1)){
				alert('The Email address doesn\'t seem to be correct,\nplease check domain suffix.');
				emailAddress.focus();
				return false;
			}
			if((domArr[domArr.length-1].length>2)&&(domArr[domArr.length-1].search(gTLDs)==-1)){
				alert('The Email address doesn\'t seem to be correct,\nplease check domain suffix.');
				emailAddress.focus();
				return false;
			}
			if((domArr[domArr.length-1].length<2)||(domArr[domArr.length-1].length>6)){
				alert('The Email address doesn\'t seem to be correct,\nplease check domain suffix.');
				emailAddress.focus();
				return false;
			}
		if(len<2){
			alert('The Email address doesn\'t seem to be correct,\nplease check missing hostname.');
			emailAddress.focus();
			return false;
		}
	}
return true;
}
String.prototype.trim = function() { return this.replace(/^\s*(\b.*\b|)\s*$/, "$1");	}
function mandatoryText(input,fieldName){
	if(input.value.trim()==''||input==null){
		alert('Please enter your '+fieldName+'.');
		input.focus();
		return false;
		} 
	else {
		return true;
	}
}
<!-- function for valid form -->
function validCLForm(){
if(!mandatoryText(document.getElementById('EMAIL_FIELD'), 'E-mail address')) { return false; }
if(!isEmail(document.getElementById('EMAIL_FIELD'))) { return false };
if(!mandatoryText(document.getElementById('FIRSTNAME_FIELD'), 'First Name')) { return false; }
if(!mandatoryText(document.getElementById('LASTNAME_FIELD'), 'Last Name')) { return false; }
if(!mandatoryText(document.getElementById('COMPANY_FIELD'), 'Church Name')) { return false; }
if(!mandatoryText(document.getElementById('ADDR_1_FIELD'), 'Church Address')) { return false; }
if(!mandatoryText(document.getElementById('CITY_FIELD'), 'City')) { return false; }
if(!mandatoryText(document.getElementById('STATE_FIELD'), 'State')) { return false; }
if(!mandatoryText(document.getElementById('ZIPCODE_FIELD'), 'Zip Code')) { return false; }
if(!mandatoryText(document.getElementById('PHONE_FIELD'), 'Phone Number')) { return false; }


<!------------------------BELOW IS FOR ONE LIST MUST BE SELECTED START-----------------------  -->

//function pickonelist(){
var myForm = document.forms['emvForm'];
var formElements = myForm.elements;
var taglength = formElements.length;
	var checked_count = 0;
	var msg = "Please choose at least one area of interest.";


	for (i=0;i<taglength;i++){
		if(formElements[i].checked)
			++checked_count;
	}
	if(checked_count < 1) {
		alert(msg);
		return false;
		
	} else {
		
		
		
		//return true;
		//document.getElementById('emvForm').submit();
	}
	

	if (document.emvForm.EMVADMIN1_FIELD.value =="")
	{
			alert("Please select a denomination");
			return false;
			
	}
	
//}

<!------------------------FOR ONE LIST MUST BE SELECTED END-----------------------  -->

<!------------------------TS_ date include START-----------------------  -->


//function setTimeStamps(f) {
//    var d, time, romance_offset, romance, YYYY, MM, DD, HH, MM, SS;
    d = new Date();
    local = d.getTime(); 
    local_offset = d.getTimezoneOffset() * 60000;
    // correct for difference in EmailVision time zone (Paris)
    //will need to update by hour at daylight savings
    romance = local + local_offset + 7200000;
    r = new Date(romance);
    YYYY = r.getFullYear();
    MM = r.getMonth() + 1;
    if(MM < 10) 
        MM = '0' + MM;
    DD = r.getDate();
    if(DD < 10) 
        DD = '0' + DD;
    hh = r.getHours();
    if(hh < 10) 
        hh = '0' + hh;
    mm = r.getMinutes();
    if(mm < 10) 
        mm = '0' + mm;
    ss = r.getSeconds();
    if(ss < 10) 
        ss = '0' + ss;
    var timestamp = YYYY + '-' + MM + '-' + DD + ' ' + hh + ':' + mm + ':' + ss;

    for (i=0;i<formElements.length;i++) {
        if ((formElements[i].value == '1') && ((formElements[i].checked) || (formElements[i].type == 'hidden'))){
            var dt_unjoin = 'TS_' + formElements[i].name;
            if(formElements[dt_unjoin]) {
                formElements[dt_unjoin].value = timestamp;
                //alert(timestamp);
            }
        }
    }
	//document.getElementById('emvForm').submit();
    if(formElements['SUBSCRIBE_DATE_FIELD'])
        formElements['SUBSCRIBE_DATE_FIELD'].value = timestamp;
    return true;
//}


	


<!------------------------TS_ date include END-----------------------  -->


}