Well, as Ipad comes to my eyes,It gives us a brand-new  exprience than ever,but as a RIA developer I have to say something that is not perfect as our imagination,like css 's atribute position:fixed, safari on ipad doesnt work at all,after surfing online a lot,I realize I have to handle it instead of javascript,it is not good like css,but it works anyway
  my solution is :
   document.ontouchmove = function () {
     hide your content you want to follow the scrollbar
   }
window.onscroll = function reportScroll() {
   // window.pageYOffset ;
   get the pageYOffset then caculate its position and set the value for it
     
}
try it and good luck
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