/*
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 Fill(oElem1,oElem2,oTarget){                           
        var strValue1 = oElem1.options[oElem1.selectedIndex].value;
        var strValue2 = oElem2.options[oElem2.selectedIndex].value;
        var url = 'http://avtostrada.net.ua/board/combo.php';                               
        var strParams = 'q1=' + strValue1 + '&q2=' + strValue2 +                             
          "&f=" + oTarget.form.name +                                   
          "&e=" + oTarget.name;                                        
        var loader1 = new net.ContentLoader(url,FillDropDown,null,"POST",strParams);                           
      }
      
      function Fill2(){
          Fill(document.FindForm.ddlType,document.FindForm.ddlType,document.FindForm.ddlMarka);
          Fill(document.FindForm.ddlType,document.FindForm.ddlMarka,document.FindForm.ddlModel);
      }
    
      function FillDropDown(){
        var xmlDoc = this.req.responseXML.documentElement;              

        var xSel = xmlDoc.                                             
           getElementsByTagName('selectElement')[0];                   
        var strFName = xSel.                                           
           childNodes[0].firstChild.nodeValue;                         
        var strEName = xSel.                                           
           childNodes[1].firstChild.nodeValue;                         
            
        var objDDL = document.forms[strFName].                         
           elements[strEName];                                         
        objDDL.options.length = 0;                                     
            
        var xRows = xmlDoc.                                            
          getElementsByTagName('entry');                               
        for(i=0;i<xRows.length;i++){                                   
          var theText = xRows[i].                                      
              childNodes[0].firstChild.nodeValue;                      
          var theValue = xRows[i].                                     
              childNodes[1].firstChild.nodeValue;                      
          var option = new Option(theText,                             
                            theValue);                           
          objDDL.options.add(option,                                   
                          objDDL.options.length);                      
        }                                                              
      }