var random = new Array();

random[0]='<a href="#"><img src="images/myles/Myles_run.jpg" width="158" height="158"  id="randomimg"  align="left" /></a>';
random[1]='<a href="#><img src="images/myles/Myles_swim.jpg" width="158" height="158"  id="randomimg"  align="left" /></a>';
random[2]='<a href="#"><img src="images/myles/Myles_snow.jpg"" width="158" height="158"  id="randomimg"  align="left" /></a>';
random[3]='<a href="#"><img src="images/myles/Myles_shop.jpg" width="158" height="158"  id="randomimg"  align="left" /></a>';




var max = random.length;
var num = Math.floor((Math.random() * max));
document.write(random[num]);