$(document).ready(function(){

$("#regionlist").change(function(){
    
    
    $("#districtlist").load("" + prelink + "/" + "projects/regionslist", {id : ($("#regionlist option:selected").val())}, function(){
   
    });
    
    if($("#regionlist option:selected").val() > 0)
         $("#districtlist").removeAttr("disabled")
    else
        $("#districtlist").attr("disabled", "disabled") 

});

});