var xmlHttp


function getPage(page,winH,winW)
{

xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 

var urlstring = page+".php"+"?winH="+winH+"&winW="+winW;

var url= urlstring;
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function getSubset(subsetID,winH,winW)
{

xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 

var urlsubstring = "subset.php?subset="+subsetID+"&winH="+winH+"&winW="+winW;

var urlsub=urlsubstring;
xmlHttp.onreadystatechange=stateChanged2;
xmlHttp.open("GET",urlsub,true);
xmlHttp.send(null);
} 





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

function stateChanged2() 
{ 
if (xmlHttp.readyState==4)
{ 
	document.getElementById("subsetdiv").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;
}