function roll(img_name, img_src)
  {
	document[img_name].src = img_src;
  }
var image1 = new Image();
image1.src = "img/btnHomeOff.png";
var image2 = new Image();
image2.src = "img/btnHomeOn.png";
var image3 = new Image();
image3.src = "img/btnGamesOff.png";
var image4 = new Image();
image4.src = "img/btnGamesOn.png";
var image5 = new Image();
image5.src = "img/btnExtrasOff.png";
var image6 = new Image();
image6.src = "img/btnExtrasOn.png";
var image7 = new Image();
image7.src = "img/btnBlogOff.png";
var image8 = new Image();
image8.src = "img/btnBlogOn.png";
var image9 = new Image();
image9.src = "img/btnForumsOff.png";
var image10 = new Image();
image10.src = "img/btnForumsOn.png";
var image11 = new Image();
image11.src = "img/btnWikiOff.png";
var image12 = new Image();
image12.src = "img/btnWikiOn.png";
var image13 = new Image();
image13.src = "images/1_big.png";