function checkValidEmail () { 
		var base = document.getElementById("Newsletter"); 
		var errStr = ""; 
	
		/* criteria checks go here */ 
		if ( base.YMLP0.value == "" || ! base.YMLP0.value.match(new RegExp("^[\\w\.=-]+@[\\w\\.-]+\\.[a-zA-Z]{2,4}$")) ) errStr += "\n> Enter a VALID email address";
		
		if (errStr != "") { 
			alert("Please review input"+errStr); 
			return false; 
		} 
		   
		return true; 
	}