function slidePage(point) {
  step=80;
  start=getWinYOffset();
  difference=point-start;
  tmp=difference;
  k = 0.90;
  i=0;
move()
}

function move() {
  if (i<step) {
    tmp=tmp*k;
    window.scroll(0,start+(difference-tmp));
    setTimeout("move()",0)
    i++;
  } else {
    window.scroll(0,difference+start)
  }
}

function getWinYOffset(){
  if(window.scrollY) return window.scrollY; // Mozilla
  if(window.pageYOffset) return window.pageYOffset; // Opera, NN4
  if(document.documentElement && document.documentElement.scrollTop){ // ˆÈ‰º IE
   return document.documentElement.scrollTop;
  }
  else if(document.body && document.body.scrollTop){
   return document.body.scrollTop;
  }
  return 0;
}