var aryImages = new Array(10);

aryImages[0] = "/images/banners/banner1.jpg";
aryImages[1] = "/images/banners/banner2.jpg";
aryImages[2] = "/images/banners/banner3.jpg";
aryImages[3] = "/images/banners/banner4.jpg";
aryImages[4] = "/images/banners/banner5.jpg";
aryImages[5] = "/images/banners/banner6.jpg";
aryImages[6] = "/images/banners/banner7.jpg";
aryImages[7] = "/images/banners/banner8.jpg";
aryImages[8] = "/images/banners/banner9.jpg";
aryImages[9] = "/images/banners/banner10.jpg";

for (i=0; i < aryImages.length; i++) {
  var preload = new Image();
  preload.src = aryImages[i];
}

function swap() {
	var randomnumber = Math.floor(Math.random()*10)
	document.write("<img src=\"" + aryImages[randomnumber] + "\" />")
   
}