function randomlargeimage() {
images = new Array(21);
images[0] = " 
";
images[1] = " 
";
images[2] = " 
";
images[3] = " 
";
images[4] = " 
";
images[5] = " 
";
images[6] = " 
";
images[7] = " 
";
images[8] = " 
";
images[9] = " 
";
images[10] = " 
";
images[11] = " 
";
images[12] = " 
";
images[13] = " 
";
images[14] = " 
";
images[15] = " 
";
images[16] = " 
";
images[17] = " 
";
images[18] = " 
";
images[19] = " 
";
images[20] = " 
";
index = Math.floor(Math.random() * images.length);
banners = index + 1;
document.write(images[index]);
}