function lock_input(gesetzt){
	
	if(gesetzt.checked == true){
<!--	window.alert('gesetzt'); -->
<!--	document.getElementById('gr_anz').value = 'text'; -->
	entsperren ('gr_anz', 'ck_banner');
	}
	
	if(gesetzt.checked == false){
		sperren ('gr_anz', 'ck_banner');
	}
	
}
<!-- Ende Function lock_input -->		


function entsperren(id, id2){
	var onlock_feld = document.getElementById(id);
	onlock_feld.disabled = false;
	
	var onlock_check = document.getElementById(id2);
	onlock_check.disabled = false;		
}



function sperren(id, id2){
	var lock_feld = document.getElementById(id);
	lock_feld.value = '';
	lock_feld.disabled = true;
	
	
	var lock_check = document.getElementById(id2);
	lock_check.checked = false;
	lock_check.disabled = true;	
	
}