function getHTTPObject() {
    var xmlhttp;
   /* @cc_on
    @if (@_jscript_version >= 5)
       try {
          xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
       } catch (e) {
          try {
             xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
          } catch (E) { xmlhttp = false; }
       }
    @else
    xmlhttp = false;
    @end @*/
    if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
       try {
          xmlhttp = new XMLHttpRequest();
       } catch (e) { xmlhttp = false; }
    }
    return xmlhttp;
}

function trim(str)
		 {
   		 return str.replace(/^\s*|\s*$/g,"");
		 }

var enProceso = false; // lo usamos para ver si hay un proceso activo
var http = getHTTPObject(); // Creamos el objeto XMLHttpRequest

function amaga(capa)
		 {
		 document.getElementById(capa).style.display = "none";
		 document.getElementById('control_'+capa).innerHTML = "<a href=\"javascript:void(0)\" onclick=\"mostra('"+capa+"')\" class=\"petitab\"><img width=9 height=9 src=\"imgs/mostra.gif\" border=\"0\" align=\"absmiddle\" hspace=\"5\">Mostrar</a>";
		 }

function mostra(capa)
		 {
		 document.getElementById(capa).style.display = "block";
		 document.getElementById('control_'+capa).innerHTML = "<a href=\"javascript:void(0)\" onclick=\"amaga('"+capa+"')\" class=\"petitab\"><img width=9 height=9 src=\"imgs/amaga.gif\" border=\"0\" align=\"absmiddle\" hspace=\"5\">Contraure</a>";
		 }