function mostra()
{
var imagenumber = 9 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "V1.jpg"
images[2] = "V2.jpg"
images[3] = "V3.jpg"
images[4] = "V4.jpg"
images[5] = "V5.jpg"
images[6] = "V6.jpg"
images[7] = "V7.jpg"
images[8] = "V8.jpg"
images[9] = "V9.jpg"
var image = images[rand1];

var e = document.getElementById("contenitoreimg");
e.innerHTML = '<img style="height:217px;width:180px" src="' + image + '" alt="Foto Galleria">';
	
}// JavaScript Document