原作者已不可考。感谢原作者，阿门。
代码如下:
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var IsMousedown, LEFT, TOP, login;
document.getElementById("Mdown").onmousedown=function(e) {
login = document.getElementById("loginBox");
IsMousedown = true;
e = e||event;
LEFT = e.clientX - parseInt(login.style.left);
TOP = e.clientY - parseInt(login.style.top);
document.onmousemove = function(e) {
e = e||event;
if (IsMousedown) {
login.style.left = e.clientX - LEFT + "px";
login.style.top = e.clientY - TOP + "px";
}
}
document.onmouseup=function(){
IsMousedown=false;
}
}