// JavaScript Document
var xmlHttp1;

function showmainpage(url)
{ 
xmlHttp1=GetXmlHttpObject();

if (xmlHttp1==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }
 
xmlHttp1.onreadystatechange=stateChanged;

xmlHttp1.open("GET",url+".php",true);

xmlHttp1.send(null);

}

function stateChanged() 
{ 
if (xmlHttp1.readyState==4 )
{ 
document.getElementById("txt").innerHTML=xmlHttp1.responseText;

}
}

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;
}