function connection()
{	
	var obj = null;	
	var extra_handler = null;
	var idle = false;
	var c = this;

	
	try{
		if(_BROWSER['firefox'])
			obj = new XMLHttpRequest();
		else
			obj = new ActiveXObject("Microsoft.XMLHTTP");		
	}
	catch(e)
	{
		alert("Unable to estabilish real-time connection.");
		return 0;
	}

	this.post = function (url,data,async)
	{
		//if(idle) return (window.status="Connection is idle");
		//idle = true;
		obj.open("POST",url,async);
			AssignProcedure();
			obj.setRequestHeader('Content-Type','application/x-www-form-urlencoded;');
   			obj.setRequestHeader("Cache-Control","no-cache");
		obj.send(data);
	}
	AssignProcedure = function () {
		if(_BROWSER['firefox']){
			obj.onload = function ()
			{	try{
						switch(obj.readyState)
						{
						case 4:idle = false;				
						}
						if(extra_handler)
							extra_handler(obj);
				}catch(e){}
			}
			
			obj.onerror = function(){
				window.status = "Connection: Unexpected status.";
			}
		}
		else
			obj.onreadystatechange = function ()
			{ try{
						switch(obj.readyState)
						{
						case 4:	idle = false;
						}
						if(extra_handler)
							extra_handler(obj,c);	
						
				}catch(e){}
			}	
	}
	this.x_handler = function(handler)
	{
		extra_handler = handler;
		
	}
	this.get = function (url,async)
	{
		if(idle) return (window.status="Connection is idle");
		idle = true;
		obj.open("GET",url,async);
			AssignProcedure();
			obj.setRequestHeader("Cache-Control","no-cache");
		obj.send(null);
	}
	this.abort = function(){
		obj.abort();	
	}
	this.obj = obj;
	
	this.getheader = function(name){
		return obj.getRequestHeader(name);	
	}
	
	this.setheader = function(name,value){
		return obj.setRequestHeader(name,value);	
	}
}