var xmlHttp

function showdivall(str1)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="page1.php";
url=url+"?aId="+str1;
xmlHttp.onreadystatechange=showdivallchange;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}
function showdivallchange() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("maindiv").innerHTML=xmlHttp.responseText;
}
}

function showdivtop(str1)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert("Your browser does not support AJAX!");
  return;
  } 
var url="page2.php";
url=url+"?aId="+str1;
xmlHttp.onreadystatechange=showdivtopchange;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function showdivtopchange() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("maindiv").innerHTML=xmlHttp.responseText;
}
}
function showdivblog(str1)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="page3.php";
url=url+"?aId="+str1;
xmlHttp.onreadystatechange=showdivblogchange;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function showdivblogchange() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("maindiv").innerHTML=xmlHttp.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;
}