function initMoving(target, position, topLimit, btmLimit) { if (!target) return false; var obj = target; obj.initTop = position; obj.topLimit = topLimit; obj.bottomLimit = document.documentElement.scrollHeight - btmLimit; obj.style.position = "absolute"; obj.top = obj.initTop; obj.left = obj.initLeft; if (typeof(window.pageYOffset) == "number") { obj.getTop = function() { return window.pageYOffset; } } else if (typeof(document.documentElement.scrollTop) == "number") { obj.getTop = function() { return document.documentElement.scrollTop; } } else { obj.getTop = function() { return 0; } } if (self.innerHeight) { obj.getHeight = function() { return self.innerHeight; } } else if(document.documentElement.clientHeight) { obj.getHeight = function() { return document.documentElement.clientHeight; } } else { obj.getHeight = function() { return 0; } } 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 / 5; obj.style.top = obj.top + "px"; }, 30) } function ScrollTop(){ self.window.scroll(0,0); }