function isValidFormString(formElement,alertString){
	if(formElement.value==''){
		alert(alertString);
		formElement.focus();
		return false;
	}
	return true;
}
function isValidFormStringMinLen(formElement,alertString,minLength){
	if(formElement.value==''||formElement.value.length < minLength){
		alert(alertString);
		formElement.focus();
		return false;
	}
	return true;
}