function nuevo_ajax(){ 
	     var xmlhttp=false; 
		 try{ 
		     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(); } 
 	     return xmlhttp; 
}

function ajaxHtml(url,idCapa,img){
	     var capa =	document.getElementById(idCapa);
		 if(img==false)img='img/cargando.gif';
	     var ajax = nuevo_ajax();
	     capa.innerHTML='<img src="'+img+'" width="16" height="11" border="0"  />Cargando...';
	     ajax.open("POST",url, true);
	     ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	     ajax.send("");
	
	     ajax.onreadystatechange=function(){
				 			 
			 if (ajax.readyState==4){
				 capa.innerHTML=ajax.responseText;
			 }
		 }	
}

function ajaxValue(url, id){
	     var ajax = nuevo_ajax();
	     ajax.open("POST",url, true);
	     ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	     ajax.send("");
	
	     ajax.onreadystatechange=function(){
			 if (ajax.readyState==4){
				 document.getElementById(id).value = ajax.responseText;
			 }
		 }	
}