var xmlHttp

function ShowCourses(str)
{
if (str.length==0)
  { 
  document.getElementById("aj_courses").innerHTML="";
  return;
  }
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="/aj_courses.aspx";
url=url+"?qssubcat="+str;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("aj_courses").innerHTML=xmlHttp.responseText;
}
}

function ShowTown(str)
{
if (str.length==0)
  { 
  document.getElementById("aj_town").innerHTML="";
  return;
  }
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="/aj_town.aspx";
url=url+"?qscourse="+str;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChangedTown;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function stateChangedTown() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("aj_town").innerHTML=xmlHttp.responseText;
document.getElementById('townName').disabled=false;
}
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}