function fCheckForm(f) {
	var mistake=false;
	var msgwrong=f.msgwrong.value;
	if (f.verplicht.value){
		var arrobliged=f.verplicht.value.split(',');
		for (i=0;i<=arrobliged.length-1;i++) {
			var x=arrobliged[i].toLowerCase();
			mistake=(eval('f.' + arrobliged[i] + '.' + 'value')=='');
			if (mistake) break;
		}
		if (mistake){ 
			eval('f.' + arrobliged[i] + '.' +  'focus()');
			alert(msgwrong);
			return false;
		} else {
			return true;
		}
	}else{
		return true;
	}
}