img = new Array();
img[0] = "../img/main_img/001.jpg";
img[1] = "../img/main_img/002.jpg";
img[2] = "../img/main_img/003.jpg";
img[3] = "../img/main_img/004.jpg";
img[4] = "../img/main_img/005.jpg";
img[5] = "../img/main_img/006.jpg";
img[6] = "../img/main_img/007.jpg";
n = Math.floor(Math.random()*img.length);
document.write("<img src='"+img[n]+"' border='0'>");