var randFolder= "../images/";
var randImages = new Array(

"random_pic3_1.jpg","random_pic3_2.jpg","random_pic3_3.jpg",
"random_pic3_4.jpg","random_pic3_5.jpg","random_pic3_6.jpg",
"random_pic3_7.jpg"

);

var ranban = Math.floor(Math.random()*(randImages.length));