// JavaScript Document
var keypressed = false;
var key1 = false;
function checkcontext(){
  if(keypressed == true){
    keypressed = false;
    return true;
  }else{
    return false;
  }
}
function checkkey(e){
  var keynum;
  if(window.event) // IE
  {
  keynum = e.keyCode;
  }
  else if(e.which) // Netscape/Firefox/Opera
  {
  keynum = e.which;
  }
  if(keynum==122){
    if(key1){
      key1 = false;
      keypressed = true;
    }else{
      key1 = true;
    }
  }
  if(keynum==118){
    if(key1){
      key1 = false;
      keypressed = true;
    }else{
      key1 = true;
    }
  }
}