css = new Array(4);
css[0] = "<div class='random_img_1'></div>"
css[1] = "<div class='random_img_2'></div>"
css[2] = "<div class='random_img_3'></div>"
css[3] = "<div class='random_img_4'></div>"
index = Math.floor(Math.random() * css.length);
document.write("");document.write("" + "" + css[index] + "");document.write("");