function checkForm(oForm, sField, sLabel) {
	if(sField != '') {
		var aField = sField.split(",");
		var aLabel = sLabel.split(","); 
		for(var iCount = 0; iCount < aField.length; iCount++) {
			var sLabel = aLabel[iCount];
			var sValue = eval("oForm." + aField[iCount] + ".value;");
			if(sValue == ''|| sValue == null) {
				alert('' + aLabel[iCount] + ' is een verplicht veld!');
				return false;
			};
		};
	};
	return true;
}