[ksa]

Хотя бы примерно

Ну косинус же!

var a=Math.round(Math.random()*2);
image = new Array();
image[0]="/Pictures/images/1.jpg";
image[1]="/Pictures/images/2.jpg";
image[2]="/Pictures/images/3.jpg";
var i=Math.round(Math.random()*2);
url = new Array();
url[0]="http://url_1.html";
url[1]="http://url_2.html";
url[2]="http://url_3.html";
document.write ("<img src="+image[a]+" onclick=\"top.location='"+url[i]+"' \">");