// JavaScript Document

var http_request=false;								// global variable for HTTPRequest
var gsdata = new Array();
var txt="";
																				
// function to request text from a specified url...
function make_request()									// execute an HTTPRequest 
{		
	if (window.XMLHttpRequest)							// create an HTTPRequest object...	
	{										// for IE7, Mozilla, Safari ...
		http_request = new XMLHttpRequest();				
	}
	else if (window.ActiveXObject)							// or create an HTTPRequest object...
	{										// for Internet Explorer 6...
		http_request = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else return false;								// or quit...

	
	//alert("Starting Request");
	http_request.onreadystatechange=show_data; 
	http_request.open("GET","http://www.gshp.welwyn.org.uk/data_store/datastream.txt"+"?rand="+new Date().getTime(),true);		// make the request to the server...
  	http_request.send(null);						  // stating method, filename, async 
	 
}


function show_data()
{ 
  if(http_request.readyState == 4)							// if complete
  { 
    if(http_request.status == 200)							// if OK
    {
		txt = http_request.responseText;
		//alert(txt);
		gsdata = txt.split(",");
		var pic_num=gsdata[275];
		window.document.getElementById("AnimPic").innerHTML = "<img src = 'Images/blank_computer_picture_"+pic_num+".gif'>";
		}
		else if (http_request.status == 404)							// if URL not found
    { window.document.getElementById("AnimPic").innerHTML = "<img src = 'Images/blank_computer_picture_0.gif'>"; }
	}
}

function timeout()
{
make_request();
window.setTimeout("timeout()",60000);
}