function centrar(url, titulo, height, width) {
	var str = "height=" + height + ",innerHeight=" + height;
	str += ",width=" + width + ",innerWidth=" + width;
	
	var ah = screen.availHeight - 30; 
	var aw = screen.availWidth - 10; 
	var xc = (aw - width) / 2;
	var yc = (ah - height) / 2;

	str += ",left=" + xc + ",screenX=" + xc;
	str += ",top=" + yc + ",screenY=" + yc;         
	
	window.open(url, titulo, str);
 }
 

function cerrarPagina(){

		window.close();
}



function ExisteElementoConClase(strTagName, strClassName){
    var lBolReturn = false;
    var arrElements = document.getElementsByTagName(strTagName);
    var oElement;
    
    for(var i=0; i<arrElements.length; i++){

        oElement = arrElements[i];
        
        if (oElement.className == strClassName){
            lBolReturn = true;
         }               
  
    }
   
    return lBolReturn
}

function VisualizarMenu(){
    if (ExisteElementoConClase("table","ControlPanel")){

        if(document.getElementById("menu_paginas"))
        {
            document.getElementById("menu_paginas").style.display='block';

        }
     }else{
         if(document.getElementById("menu_paginas"))
        {
            document.getElementById("menu_paginas").style.display='none';
        }
     }
}