// JavaScript Document

var goto_top_type = -1;
var goto_top_itv = 0;
function goto_top_timer() {
      var y = goto_top_type == 1 ? document.documentElement.scrollTop : document.body.scrollTop;
         var moveby = 15;
         y -= Math.ceil(y * moveby / 100);
         if (y < 0) {
         y = 0;
         }
         if (goto_top_type == 1) {
         document.documentElement.scrollTop = y;
         }
         else {
         document.body.scrollTop = y;
         }
         if (y == 0) {
         clearInterval(goto_top_itv);
         goto_top_itv = 0;
         }
}
function goto_top() {
         if (goto_top_itv == 0) {
                  if (document.documentElement && document.documentElement.scrollTop) {
                  goto_top_type = 1;
                  }
                  else if (document.body && document.body.scrollTop) {
                  goto_top_type = 2;
                  }
                  else {
                  goto_top_type = 0;
                  }
           if (goto_top_type > 0) {
                  goto_top_itv = setInterval('goto_top_timer()', 50);
                  }
         }
}