var xmlhttp = false;
try{
   //comprobamos si es IE
   xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
   try{
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
   }catch(e){
      xmlhttp = false;
   }
}

if(!xmlhttp && typeof XMLHttpRequest != 'undefined'){
   xmlhttp = new XMLHttpRequest();
}

function cargaWeb(url){	

	var capa = window.document.getElementById("cuerpo");	
	xmlhttp.open("GET", url);
	xmlhttp.onreadystatechange = function(){
	   if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
	      capa.innerHTML = xmlhttp.responseText;			
	   }		
	}

	xmlhttp.send(null);				

}

// Obterner la URL
var url = document.location.href;
// Nos quedamos con los parámetros 
url = url.substring(url.lastIndexOf('?')+1);
// Dividimos los distintos parámetros
param=url.split('&'); 

function getQueryParam(variable){

   var partes="";
   for (var i=0;i<param.length;i++){
      partes=param[i].split('=');
      if (partes[0]==variable){
         return partes[1];
      }
   }
   return "index";
}


function popUp(site,ww,hh,ventana,scroll) {
   var vars = 'locationbar=no, toolbar=no, titlebar=no, scrollbars='+scroll+', resizeable=no, alwaysRaised=no, directories=no, menubar=no, location=no, width='+ ww + ', height=' + hh + ', left = 50, top = 50';
   var newWin = open(site, ventana, vars);
}