function chg(id) {
	var elementosMenu = getElementsByClassName(document, "li", "activo");
	for (k = 0; k< elementosMenu.length; k++) {
	elementosMenu[k].className = "inactivo";
	}
	var identity=document.getElementById(id);
	identity.className="activo";
}

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && document.all)? document.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements)
}


	function dta(origen)
	{
		xmlHttp=GetXmlHttpObject()
		if (xmlHttp==null)
		  {
		  alert ("Su navegador no soporta AJAX!");
		  return;
		  } 
		var url=origen;
		xmlHttp.onreadystatechange=stateChanged;
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);
	}
	
	function GetXmlHttpObject()
	{
	  var xmlHttp=null;
	  try
	    {
	    // Firefox, Opera 8.0+, Safari
	    xmlHttp=new XMLHttpRequest();
	    }
	  catch (e)
	    {
	    // Internet Explorer
	    try
	      {
	      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	      }
	    catch (e)
	      {
	      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	      }
	    }
	  return xmlHttp;
	}
	
		
	function stateChanged() 
	{ 
		if (xmlHttp.readyState==4)
		{ 
		document.getElementById("tabdata").innerHTML=xmlHttp.responseText;
		}
	}