var net = new Object();
		
		var READY_STATE_INITIALIZED=0;
		var READY_STATE_LOADING=1;
		var READY_STATE_LOADED=2;
		var READY_STATE_INTERACTIVE=3;
		var READY_STATE_COMPLETE=4;
	
				
		// CONSTRUCTOR
		
		net.CargadorContenidos = function(url,funcion,funcionError,metodo,parametros,contentType){
			this.url=url;
			this.req=null;
			this.onload=funcion;
			this.onerror= (funcionError)? funcionError : this.defaultError;
			this.cargaContenidoXML(url,metodo,parametros,contentType);			
		}
		
		net.CargadorContenidos.prototype={
			cargaContenidoXML: function(url,metodo,parametros,contentType){
				if(window.XMLHttpRequest){	
					this.req = new XMLHttpRequest();
				}else if(window.ActiveXObject){
					this.req = new ActiveXObject("Microsoft.XMLHTTP");	
				}
				if(this.req){
					try{
						var loader = this;
						this.req.onreadystatechange = function(){
							loader.onReadyState.call(loader);
						}
						this.req.open(metodo,url,true);
						
						if(contentType){
							this.req.setRequestHeader("Content-Type",contentType);
						}
						
						this.req.send(parametros);
					}catch(err){
						this.onerror.call(this);	
					}
				}
			},
			
			onReadyState: function(){
				var req= this.req;
				var ready = req.readyState;
				if(ready == READY_STATE_COMPLETE){
					var httpStatus = req.status;
					if( httpStatus == 200 || httpStatus == 0){
						this.onload.call(this);
					}else{
						this.onerror.call(this);	
					}	
				}	
			},	
			
			defaultError: function(){
				alert("SE HA PRODUCIDO UN ERROR AL OBTENER LOS DATOS" 
				+ "\n\nreadyState:" + this.req.readyState	
				+"\nstatus: " + this.req.status	
				+"\nheaders: " + this.req.getAllResponseHeaders());	
			}
		}
		
		function muestraContenido(){
					
		}
		
		function cargaContenidos(){
			var cargador = new net.CargadorContenidos("http://www.agexscochile.cl/containformador/contador.php", muestraContenido, "","POST","sumar=ok","application/x-www-form-urlencoded");	
		}