var imagenumber = 11 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "/images/tmb_pic1.jpg"
images[2] = "/images/tmb_pic2.jpg"
images[3] = "/images/tmb_pic3.jpg"
images[4] = "/images/tmb_pic4.jpg"
images[5] = "/images/tmb_pic6.jpg"
images[6] = "/images/tmb_pic7.jpg"
images[7] = "/images/tmb_pic8.jpg"
images[8] = "/images/tmb_pic9.jpg"
images[9] = "/images/tmb_pic10.jpg"
images[10] = "/images/tmb_pic11.jpg"
images[11] = "/images/tmb_pic12.jpg"
var image = images[rand1]