/*



Cross-Platform AJAX Support Library.

Installation:

  <script language="JavaScript" src="ajax.js" type="text/javascript"></script>



Usage:



Replace page without refresh

    ajaxReplacePage('blah.php?a=123');



Replace a ID'd Div section

    ajaxReplaceArea('divname','ajx.php','option=1&u=0')

*/



var xmlHttp;

var myObj=null;



function ajaxGetObject(b) {

   var imgs,i, temp;

   temp =document.getElementById(b);

   if(temp) return temp;

   imgs=document.getElementsByTagName('div');

   for(i in imgs) {

     if(imgs[i].id==b) return imgs[i];

   }

 }



function ajaxReplacePageRecv() {

  if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {

    document.write(xmlHttp.responseText);

  }

}



//Replaces Entire page by AJAX.

function ajaxReplacePage(url) {

  xmlHttp = getHTTPObject();            //Create AJAX Object

  if(xmlHttp==null) {                   //Check if AJAX is supported

    alert ("Ajax not available")

    return

  }

  xmlHttp.onreadystatechange=replacePageRecv;      //State change goes to this function

  xmlHttp.open("GET",url,true);                 //Ready Socket

  xmlHttp.send(null);                           //Send request

}



function stateChanged() {

 if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {

    myObj.innerHTML = xmlHttp.responseText;

    myObj=null;

  }

 }



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;

}



function ajaxReplaceArea(objname,url,params) {

  if(!myObj) {

//    myObj = document.getElementById(objname);

    myObj = ajaxGetObject(objname);

  } else {

    alert('There is a request currently in progress, please wait.');

  }



  xmlHttp = getHTTPObject();            //Create AJAX Object

  if(xmlHttp==null) {                   //Check if AJAX is supported

    alert ("Ajax not available");

    return;

  }



  if(params) {

    url=url+'?'+params;

    url=url+"&rand_sid="+Math.random();

  } else {

    url=url+"?rand_sid="+Math.random();

  }

  xmlHttp.onreadystatechange=stateChanged;      //State change goes to this function

  xmlHttp.open("GET",url,true);                 //Ready Socket

  xmlHttp.send(null);                           //Send request

  return false;

 }