var i_mes=0
news = new Array
news[i_mes] = '<a href="http://www.theparsnipship.co.uk" target="_blank" class="advert"><img src="images/ads/parsnip.jpg" alt="The Parsnipship Collective" width="467" height="60" border="0" /></a>'
i_mes++
news[i_mes] = '<a href="http://www.vegshoes.com" target="_blank" class="advert"><img src="images/ads/vegshoes.gif" alt="Vegetarian Shoes" width="468" height="60" border="0" /></a>'
i_mes++

var maxnumber = news.length
var number = Math.round((maxnumber-1) * Math.random());  
var item = news[number]
document.write(item);