$(document).ready(function(){

  $("#category_id").change(function(){
	  var category = $("#category_id option:selected").val();
	  $.get("http://www.metaldesign.sk/ajax/category/"+category,
    		function(data){
    			$("#subcategory_id").html(data);
    		});
  });

  $("#subcategory_id").change(function(){
	    var subcategory = $("#subcategory_id option:selected").val();
	    if(subcategory > 0) {
	    	$.get("http://www.metaldesign.sk/ajax/subcategory/"+subcategory,
	    	    function(data){
	    			document.location.href =data;
   	    		});
	    }
  });

});