var images = new Array;
images[1]="home";
images[2]="bedroom";
images[3]="bedroom2";
images[4]="contact";
images[5]="draw";
images[6]="dressing";
images[7]="toilet";

i = Math.round((Math.random()*6)+1);
var image=new Image;
image.src = 'images/pic_' + images[i] + '.jpg';

$(function() {
 	$("#ri").attr("src",image.src);
});