var xmlHttp

function showMenu(str)
{ 
//alert("in");
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
if (str == "index")
{
var url="index.html";
}
else if (str == "sacon")
{
var url="sacon/aboutus.html";
}
else if (str == "envis")
{
var url="envis/envis.html";
}
else if (str == "publication")
{
var url="publication/publication.html";
}
else if (str == "purpose")
{
var url="website/purpose.html";
}
else if (str == "ramsar")
{
var url="cepa/ramsarcepa.html";
}
else if (str == "biodiversity")
{
var url="biodiversity/biodiversity.html";
}
else if (str == "wetlands")
{
var url="wetlands/wetlands.html";
}
else if (str == "database")
{
var url="expert/expert.html";
}
else 
{
var url="sacon/contact.html";
}

xmlHttp.onreadystatechange=function()
{ 
if (xmlHttp.readyState==4)
{ 
if(str =='index')
{
document.getElementById("main_index").innerHTML=xmlHttp.responseText;
}else
{
document.getElementById("main").innerHTML=xmlHttp.responseText;
}
}
}
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}


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;
}