//all images in the images/banners folder will be numbered, one through 31-->
  var arrCount = new Array("a");
  function loadImage() {
     Num = get_random();
	
	 if (findIdx(Num,arrCount) != -1){
	   while (findIdx(Num,arrCount) != -1){
	     Num = get_random();
	   }
	 }
	 arrCount.push(Num);
	 return Num;
  }
  function get_random()
{
    var ranNum= Math.floor(Math.random()*30);

    return ranNum;
}

function findIdx(item, arr) {
// find index position of {item}
// in Array {arr} - return -1, if
// item not found
var idx = -1;
var theItem = arr.join().indexOf(item);
 if (theItem >= 0) {
    idx = theItem
 }
return idx;
}
document.write("<td><img src='assets/images/banner/" + loadImage() + ".jpg' width='202' height='144'/></td>");
document.write("<td><img src='assets/images/banner/" + loadImage() + ".jpg' width='202' height='144'/></td>");
document.write("<td><img src='assets/images/banner/" + loadImage() + ".jpg' width='202' height='144'/></td>");