/*
url-loading object and a request queue built on top of it
*/

/* namespacing object */
var net=new Object();

net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;


/*--- content loader object for cross-browser requests ---*/
net.ContentLoader=function(url,onload,onerror,method,params,contentType){
  this.req=null;
  this.onload=onload;
  this.onerror=(onerror) ? onerror : this.defaultError;
  this.loadXMLDoc(url,method,params,contentType);
}

net.ContentLoader.prototype.loadXMLDoc=function(url,method,params,contentType){
  if (!method){
    method="GET";
  }
  if (!contentType && method=="POST"){
    contentType='application/x-www-form-urlencoded';
  }
  if (window.XMLHttpRequest){
    this.req=new XMLHttpRequest();
  } else if (window.ActiveXObject){
    this.req=new ActiveXObject("Microsoft.XMLHTTP");
  }
  if (this.req){
    try{
      var loader=this;
      this.req.onreadystatechange=function(){
        net.ContentLoader.onReadyState.call(loader);
      }
      this.req.open(method,url,true);
      if (contentType){
        this.req.setRequestHeader('Content-Type', contentType);
      }
      this.req.send(params);
    }catch (err){
      this.onerror.call(this);
    }
  }
}


net.ContentLoader.onReadyState=function(){
  var req=this.req;
  var ready=req.readyState;
  if (ready==net.READY_STATE_COMPLETE){
    var httpStatus=req.status;
    if (httpStatus==200 || httpStatus==0){
      this.onload.call(this);
    }else{
      this.onerror.call(this);
    }
  }
}

net.ContentLoader.prototype.defaultError=function(){
  alert("error fetching data!"
    +"\n\nreadyState:"+this.req.readyState
    +"\nstatus: "+this.req.status
    +"\nheaders: "+this.req.getAllResponseHeaders());
}

function loadXMLDoc(url){
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (req) {
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send(null);
    }

}

////////////////////////


function ajaxChangeBody(theSelect) {
	var theCode = theSelect.value;
	var theParams = "body=" + theCode;
	var loader1 = new net.ContentLoader('feeds/ajax_get_condcode.asp?'+theParams, displayProcedures, null, "GET", null);
}

function displayProcedures(){
	var xmlDoc = this.req.responseText;
	theNewDD = document.getElementById('theProcedureDD');
	theNewDD.innerHTML = xmlDoc;

	ajaxChangeProcedure(document.FindConsultantForm.condcode);
}

function ajaxChangeProcedure(theSelect) {
	var theCode = theSelect.value;
	var theParams = "condcode=" + theCode;
	var loader1 = new net.ContentLoader('feeds/ajax_get_specid.asp?'+theParams, displaySpecialties, null, "GET", null);
}

function displaySpecialties(){
	var xmlDoc = this.req.responseText;
	theNewDD = document.getElementById('theSpecialtyDD');
	theNewDD.innerHTML = xmlDoc;
}


function ajaxChangeDealer(theSelect) {
	var theCode = theSelect.value;
	var theParams = "theManufacturerID=" + theCode;
	var loader1 = new net.ContentLoader('/ajax_get_dealers.asp?'+theParams, displayDealers, null, "GET", null);
}

function displayDealers(){
	var xmlDoc = this.req.responseText;
	theNewDD = document.getElementById('centreSelect');
	theNewDD.innerHTML = xmlDoc;
	
	var xmlDoc = "";
	theNewDD2 = document.getElementById('theCentre');
	theNewDD2.innerHTML = xmlDoc	
}

function ajaxChangeCentre(theSelect) {
	var theCode = theSelect.value;
	var theParams = "theCentreID=" + theCode;
	var loader1 = new net.ContentLoader('/ajax_get_centre.asp?'+theParams, displayCentre, null, "GET", null);
}

function displayCentre(){
	var xmlDoc = this.req.responseText;
	theNewDD = document.getElementById('theCentre');
	theNewDD.innerHTML = xmlDoc;
}