var imagenumber = 5 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "http://www.diamondsandwatches.com/images/ad_chronoswiss_17.gif"
images[2] = "http://www.diamondsandwatches.com/images/ad_general_17.gif"
images[3] = "http://www.diamondsandwatches.com/images/ad_glycine_17.gif"
images[4] = "http://www.diamondsandwatches.com/images/ad_officina_17.gif"
images[5] = "http://www.diamondsandwatches.com/images/ad_ulysse_17.gif"
var image = images[rand1]