function ajax_change(list1, list2, ac, field) {
        var url = "Ajax.do";
        var id = $("#"+list1+" option:selected").val();
        $.ajax(
        {
            type: 'POST',
            url: url,
            data: {ac: ac, field: id},
            success: function(data) {
				$("#"+list2+" option").remove();
                 var myArray = data.split(";")
                 for(i=0; i<myArray.length; i++) { 
                     $("#"+list2).append("<option id="+myArray[i]+">"+myArray[i]+"</option>")
                }
        
            }
        })
        return false;
    }