var r_image = new Array (7)
r_image[0] = "images/header_001.jpg";
r_image[1] = "images/header_002.jpg";
r_image[2] = "images/header_003.jpg";
r_image[3] = "images/header_004.jpg";
r_image[4] = "images/header_005.jpg";
r_image[5] = "images/header_006.jpg";
r_image[6] = "images/header_007.jpg";
var rand_int=Math.floor(Math.random()*7);