function gototop(acceleration,stime) {

   acceleration = acceleration || 0.1;
   stime = stime || 10;
   var x1 = 0;
   var y1 = 0;
   var x2 = 0;
   var y2 = 0;
   var x3 = 0;
   var y3 = 0; 
   if (document.documentelement) {
       x1 = document.documentelement.scrollleft || 0;
       y1 = document.documentelement.scrolltop || 0;
   }
   if (document.body) {
       x2 = document.body.scrollleft || 0;
       y2 = document.body.scrolltop || 0;
   }
   var x3 = window.scrollx || 0;
   var y3 = window.scrolly || 0;
 
 
   var x = math.max(x1, math.max(x2, x3));

   var y = math.max(y1, math.max(y2, y3));
 

   var speeding = 1 + acceleration;
   window.scrollto(math.floor(x / speeding), math.floor(y / speeding));
 
   if(x > 0 || y > 0) {
       var run = "gototop(" + acceleration + ", " + stime + ")";
       window.settimeout(run, stime);
   }
}

function closebox(event){
  $('.floating_ck').addclass('close_box');
  $('.open').addclass('open_box');
}
function openbox(event){
  $('.floating_ck').removeclass('close_box');
  $('.open').removeclass('open_box');
}