//Ensure the email address has a valid format - xxx@yyy.zzz
    function checkEmail(theEmail) {
    	var adrAT = theEmail.split("@");
    	var adrDOT = theEmail.split(".");
    
    	if (theEmail.length == 0){
			alert("You must provide your email address");
			return false;
		}
    
    	if (theEmail.indexOf("@") == -1){
    		alert ("No '@' present in email address");
    		return false;
    	}
    	else {
    		if(adrAT[0].length < 1){
    		alert ("User address before '@' absent");
    		return false;
    		}
    
    		if(adrAT[1].indexOf(".") == -1){
    		alert ("No dot present in email address");
    		return false;
    		}
    
    		if (theEmail.indexOf("@.") != -1){
    		alert ("User address between '@' and '.' absent");
    		return false;
    		}
    
    		if(adrDOT[1].length < 1){
    		alert ("User address after '.' absent");
    		return false;
    		}
    	}
    	return true;
    }