function initMoving(target, position, topLimit, btmLimit) {
  if (!target)
   return false;

  var obj = target;
  obj.initTop = position;
  obj.topLimit = topLimit;
  obj.bottomLimit = Math.max(document.documentElement.scrollHeight, document.body.scrollHeight) - btmLimit - obj.offsetHeight;


  obj.style.position = "absolute";
  obj.top = obj.initTop;
  obj.left = obj.initLeft;


  if (typeof(window.pageYOffset) == "number") {    //WebKit
      obj.getTop = function() {
          return window.pageYOffset;
      }
  } else if (typeof(document.documentElement.scrollTop) == "number") {
      obj.getTop = function() {
          return Math.max(document.documentElement.scrollTop, document.body.scrollTop);
      }
  } else {
      obj.getTop = function() {
          return 0;
      }
  }

  if (self.innerHeight) {    //WebKit
      obj.getHeight = function() {
          return self.innerHeight;
      }
  } else if(document.documentElement.clientHeight) {
      obj.getHeight = function() {
          return document.documentElement.clientHeight;
      }
  } else {
      obj.getHeight = function() {
          return 500;
      }
  }

  obj.move = setInterval(function() {
      if (obj.initTop > 0) {
          pos = obj.getTop() + obj.initTop;
      } else {
          pos = obj.getTop() + obj.getHeight() + obj.initTop;
          //pos = obj.getTop() + obj.getHeight() / 2 - 15;
      }


      if (pos > obj.bottomLimit)
          pos = obj.bottomLimit;
      if (pos < obj.topLimit)
          pos = obj.topLimit;


      interval = obj.top - pos;
      obj.top = obj.top - interval / 3;
      obj.style.top = obj.top + "px";
  }, 30)
}