function checkRequired(fieldObj,alertMsg){
	el = document.getElementById(fieldObj);
	if (el.value==null||el.value==""){
		alert(alertMsg);
		return false;
	}else{
		return true;
	}
}

function checkForm(formObj,fieldArray,fieldNames){
	with (formObj){
	 for (i=0; i<fieldArray.length; i++){
		if (!checkRequired(fieldArray[i],fieldNames[i] + " must be filled out!")){
		 document.getElementById(fieldArray[i]).focus();
		 return false;
		 break;
		}
	 }
	}
}