function checkfields( theForm ) {
	var strfname;
	var strlname;
	var strphone;
	var stremail;
	var error=false;
	var msg="";
	
	strfname = theForm.First_Name.value;
	strlname = theForm.Last_Name.value;
	strphone = theForm.Phone.value;
	stremail = theForm.Email.value;
	
	if (strfname=="") {
		msg="Please provide your first name\n"
		error=true;
	}
	
	if (strlname=="") {
		msg = msg +"Please provide your last name\n";
		error=true;
	}
	
	if (strphone=="") {
		msg = msg +"Please provide your phone number\n";
		error=true;
	}
	
	if (stremail=="") {
		msg = msg +"Please provide your email address\n";
		error=true;
	}
	
	else if(!EmailIsValid(stremail)){
		msg = msg + "Please enter in a valid email address\n";
		error = true;
	}
	
	if (error==true) {
			alert(msg);
			return false;
	}
	return true;
}

function EmailIsValid(checkThisEmail)
{
var myEMailIsValid = true;
var myAtSymbolAt = checkThisEmail.indexOf('@');
var myLastDotAt = checkThisEmail.lastIndexOf('.');
var mySpaceAt = checkThisEmail.indexOf(' ');
var myLength = checkThisEmail.length;


// at least one @ must be present and not before position 2
// @yellow.com : NOT valid
// x@yellow.com : VALID

if (myAtSymbolAt < 1 )
 {myEMailIsValid = false}


// at least one . (dot) afer the @ is required
// x@yellow : NOT valid
// x.y@yellow : NOT valid
// x@yellow.org : VALID

if (myLastDotAt < myAtSymbolAt)
 {myEMailIsValid = false}

// at least two characters [com, uk, fr, ...] must occur after the last . (dot)
// x.y@yellow. : NOT valid
// x.y@yellow.a : NOT valid
// x.y@yellow.ca : VALID

if (myLength - myLastDotAt <= 2)
 {myEMailIsValid = false}


// no empty space " " is permitted (one may trim the email)
// x.y@yell ow.com : NOT valid

if (mySpaceAt != -1)
 {myEMailIsValid = false}

return myEMailIsValid
}