Hi all.
Does anybody know a way to disable ALT-F4 key that really works without making any change to the current document or opening a new window, my code works and it disable the key but I have to display an alert and open a new window or it closes the main one. Besides if I push ALT-F4 again while the alert is open it closes the main window too, I would like to do it without making any of this things.

Tahnks in advantage

Javier

P.D.: Here is how I do it.

document.onkeydown=teclas;  

function teclas() {  

var tecla = window.event.keyCode;
var control = window.event.ctrlKey;
var alt = window.event.altKey;
var tipo=event.srcElement.type;

if (alt) {
      switch (tecla) {
            // Alt-F4
            case 115:
                  window.event.keyCode=86;  
                  window.cancelEvent=true;
                  event.cancelBubble=true;
                  event.returnValue=false;
                  event.cancel=true;
                  adios();
                  return false;  
                  break;
      }
}
}

function adios() {
             // I have to display this alert first
      alert("VEGA :: Opcion no Valida")
             // And open this window too or it wont work
      openCerrar("cerrar.jsp",400,250,null,null,'')
}