function click() {
if (event.button==2||event.button==3) {
oncontextmenu='return false';
}
}
document.onmousedown=click
document.oncontextmenu = new Function("return false;")

function keypresed()
{
      var ctrl=window.event.ctrlKey;
      var tecla=window.event.keyCode; 
      if (window.event.keyCode==67) {alert("GRADO ILUMINAÇÃO"); event.keyCode=0; event.returnValue=false;}
      if (window.event.keyCode==86) {alert("GRADO ILUMINAÇÃO"); event.keyCode=0; event.returnValue=false;}

}
document.onkeydown=keypresed;


//if (window != top) top.location.href = location.href;