var refer=document.referrer;
 var google=/google/;
 var yahoo=/yahoo/;
 var msn=/msn/;
 var allmagic=/allmagic/;
 var cafe=/cafe/;
 var amazon=/amazon/;
 var exdate=new Date();   
exdate.setDate(exdate.getDate()+1);
expires=exdate.toGMTString();

  
 if (google.test(refer))
   { 
     var cookie_string = 'referer'+'='+'google'+'; expires='+expires+';';
   } 
 if (yahoo.test(refer))
   {  
     var cookie_string = 'referer'+'='+'yahoo'+'; expires='+expires+';';
   } 
 if (amazon.test(refer))
   {  
     var cookie_string = 'referer'+'='+'amazon'+'; expires='+expires+';';
   } 
 if (msn.test(refer))
   {  
     var cookie_string = 'referer'+'='+'msn'+'; expires='+expires+';';
   }  
 if (allmagic.test(refer))
   { 
     var cookie_string = 'referer'+'='+'allmagic'+'; expires='+expires+';';
   } 
 if (cafe.test(refer))
   { 
     var cookie_string = 'referer'+'='+'cafe'+'; expires='+expires+';';
   } 

   document.cookie = cookie_string;