var Xpos = 0;
var Ypos = 0;
var Ygravity = 0.9;
var scrollPos = 0;

function FloatMenu() { 
scrollPos = document.body.scrollTop; // update scrollbar position
Xpos = 200; //¿ò¿ò×ó±ß¾à
Yboundary = scrollPos + 190;
if (floater.offsetTop < Yboundary - 10) // Object is behind boundary
Ypos += 3;
if (floater.offsetTop > Yboundary + 10) // Object is past boundary
Ypos -= 3;
Ypos *= Ygravity; // Slow object down
floater.style.pixelLeft = Xpos;
floater.style.pixelTop += Ypos; // Make object bounce
}
window.setInterval("FloatMenu()", 40); //