if(document.cookie.indexOf('style=1')>=0) 
document.write('<link rel="stylesheet" type="text/css" href="http://www.aschart.kcl.ac.uk/css/textonly.css">\n');
else document.write('<link rel="stylesheet" type="text/css" href="http://www.aschart.kcl.ac.uk/css/default.css">\n');


function chooseStyle (newstyle){
  
var expdate = new Date();
  
expdate.setTime(expdate.getTime() + (1000*3600*24*365));
  
document.cookie = 'style=' + newstyle + '; expires=' + expdate.toGMTString() + '; path=/';
  
self.location = self.location;
  
}