var j=parseInt(Math.random()*2);
  j=(isNaN(j))?0:j;

function writeHomeImage(){
  list = new Array();
  list[list.length]='/Portals/_default/Skins/OUPress/images/home_photo1.jpg';
  list[list.length]='/Portals/_default/Skins/OUPress/images/home_photo2.jpg';
  
  document.write('<img src="'+list[j]+'" border="0" usemap="#Map" />');
  
}

 var k=parseInt(Math.random()*2);
  k=(isNaN(k))?0:j;

function writeMemberHomeImage(){
  list = new Array();
  list[list.length]='/Portals/_default/Skins/OUPress/images/memberhome_photo1.jpg';
  list[list.length]='/Portals/_default/Skins/OUPress/images/memberhome_photo2.jpg';
  
  document.write('<img src="'+list[k]+'" border="0" />');
  
}