function chooseBanner ( )
{
    //  Declare variables
    var bannerArray = new Array();
    var bannerNo;
    var maxBanners = 6; // Should be 1 less than length of array
    
    //  Populate array
    bannerArray[0] = '<img src="LayoutImages/Banners/banner1.jpg" alt="Banner" border="0" />';
    bannerArray[1] = '<img src="LayoutImages/Banners/banner2.jpg" alt="Banner" border="0" />';
    bannerArray[2] = '<img src="LayoutImages/Banners/banner3.jpg" alt="Banner" border="0" />';
    bannerArray[3] = '<img src="LayoutImages/Banners/banner4.jpg" alt="Banner" border="0" />';
    bannerArray[4] = '<img src="LayoutImages/Banners/banner5.jpg" alt="Banner" border="0" />';
    bannerArray[5] = '<img src="LayoutImages/Banners/banner6.jpg" alt="Banner" border="0" />';
    bannerArray[6] = '<img src="LayoutImages/Banners/banner7.gif" alt="Banner" border="0" />';
    
    bannerNo = Math.round(Math.random() * maxBanners);

    return bannerArray[bannerNo];
}