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var imagenumber = 4 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;

images = new Array
links = new Array

images[1]="http://intarch.ac.uk/advert/banners/york.gif";
links[1]="http://www.york.ac.uk/depts/arch/";
images[2]="http://intarch.ac.uk/advert/banners/cba.gif";
links[2]="http://www.britarch.ac.uk";
images[3]="http://intarch.ac.uk/advert/banners/glasgow.gif";
links[3]="http://www.gla.ac.uk/archaeology/";
images[4]="http://intarch.ac.uk/advert/banners/ucl3.gif";
links[4]="http://www.ucl.ac.uk/archaeology/";


var image=images[rand1];
var link=links[rand1];

document.write(' <a href=" '+link+' " target="new_window"><img src="'+image+'" border="0" alt="Advertisement"></a> ');

// -- end hiding here -->

