function update_sub_cat(){
	var cat_field = document.getElementById("cat");
	var sub_cat_field = document.getElementById("sub_cat");
	var this_cat = cat_field.value;
	sub_cat_field.options.length=1;
	
	var url = "/php_inc/get_menus.php?prnt="+ this_cat;
	
	http.open("GET", url , true);
	http.onreadystatechange = handleHttpResponseSubCat;
	http.send(null);
}
function update_state(){
	var country_field = document.getElementById("country");
	var state_field = document.getElementById("state");
	var this_cat = country_field.value;
	state_field.options.length=1;
	
	var url = "/php_inc/get_menus.php?cntry="+ this_cat;
	
	http.open("GET", url , true);
	http.onreadystatechange = handleHttpResponseState;
	http.send(null);
}


// format:	
//	sub_cat_field.options[3] = new Option(text, value, defaultSelected, selected);

function handleHttpResponseSubCat() {
  if (http.readyState == 4) {
	var update_field = document.getElementById("sub_cat");
	results = http.responseText.split("\t");
	for(var r=0; r < results.length;r++){
		menu_count++;
		var this_set = results[r].split("|");
		if(this_set[1] != undefined && this_set[1] != "" && this_set[1] != -1)
		update_field.options[menu_count] = new Option(this_set[1],this_set[0],false, false);
	}
	menu_count = 0;
  }
}

function handleHttpResponseState() {
  if (http.readyState == 4) {
  
	var update_field = document.getElementById("state");
	results = http.responseText.split("\t");
	for(var r=0; r < results.length;r++){
		menu_count++;
		var this_set = results[r].split("|");
		if(this_set[1] != undefined && this_set[1] != "")
		update_field.options[menu_count] = new Option(this_set[1],this_set[0],false, false);
	}
	menu_count = 0;
  }
}


// create request object

function getHTTPObject() {
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}

var menu_count = 0;
var http = getHTTPObject(); // We create the HTTP Object