function lightbox() {
    document.getElementById('m').className='on';
	document.getElementById('d').style.display='block';
 	}
function lightboxclose() {
    document.getElementById('m').className='off';
	document.getElementById('d').style.display='none';
 	}	


function keyval(e)
 {
 if (navigator.appName=='Microsoft Internet Explorer')
  {
    e=window.event.keyCode //for IE
  }
  else
  {
    e=e.which;  // For Mozilla and netscape
  }  
  if (e==88) lightboxclose();
 }
 document.onkeydown=keyval;