function DOM(n) {return 'document.getElementById("'+n+'")';}

   function chpic0(){
         eval(DOM('pic')+'.style.backgroundImage="url(1.jpg)"');
         $('pic').appear({afterFinish:chpic1});
   }

   function chpic1(){
         //$('pic').fade({ delay: 2,afterFinish:chpic2 });
   }

   function chpic2(){
         eval(DOM('pic')+'.style.backgroundImage="url(2.jpg)"');
         $('pic').appear({afterFinish:chpic3});
   }

   function chpic3(){
         //$('pic').fade({ delay: 2,afterFinish:chpic4 });
   }

   function chpic4(){
         eval(DOM('pic')+'.style.backgroundImage="url(3.jpg)"');
         $('pic').appear({afterFinish:chpic5});
   }

   function chpic5(){
         //$('pic').fade({ delay: 2,afterFinish:chpic0 });
   }