function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
var ventana = 0;

function popUp(URL){
            if (!ventana || ventana.closed){
                ventana = window.open(URL, 'window1', 'toolbar=0,scrollbars=0,location=0,status=0,menubar=0,resizable=0,width=360,height=240'); 
            }
        }
        
        function popUp2(URL){
            if (!ventana || ventana.closed){
                ventana = window.open(URL, 'window1', 'toolbar=0,scrollbars=0,location=0,status=0,menubar=0,resizable=0,width=340,height=240'); 
            }
        }