var bannerPath = 'http://www.altamura.co.uk/images/gallery_rotator/';

  function banner(src, alt){
    this.src = src;
	this.alt = alt;
	this.showBanner = showBanner;
	
    function showBanner(){
      document.write('<img src="' + bannerPath + src + '" alt="' + alt + '" border="0" />');
	  }
    }
	
  function randomNumber(limit){
    return Math.floor(Math.random()*limit);
	}