function check_uncheck(box,id_name){ 
   input = document.getElementById(id_name);
	if (input.value == '0'){			
			input.value='1';
			box.src = box.src.replace(/_u.gif/,'_c.gif');			
		}
		else {
			input.value='0';
			box.src = box.src.replace(/_c.gif/,'_u.gif');
		}
}