//					
var isDOM = (document.getElementById ? true : false); 
var isIE4 = ((document.all && !isDOM) ? true : false); 
var isNS4 = (document.layers ? true : false); 
					
function getRef(id) 
{ 
if (isDOM) return document.getElementById(id); 
if (isIE4) return document.all[id]; 
if (isNS4) return document.layers[id]; 
} 
					
var isNS = navigator.appName == "Netscape"; 
function moveRightEdge() { 
var yMenuFrom, yMenuTo, yOffset, timeoutNextCheck; 
if (isNS4) { 
//yMenuFrom   = divMenu.top; 
yMenuFrom   = divMenu.bottom; 
yMenuTo     = windows.pageYOffset - 100 ;   // 困率 困摹 
} else if (isDOM) { 
//yMenuFrom   = parseInt (divMenu.style.top, 10); 
yMenuFrom   = parseInt (divMenu.style.top, 10); 
	
//alert(document.body.scrollTop + " " + document.body.offsetHeight);

yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop + document.body.offsetHeight ) - 120; //浮动的位置＝底部位置－数值 
//yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop ) + 50; //浮动的位置：顶部位置＋数值
//yMenuTo     = (isNS ? window.pageYOffset : document.body.offsetHeight) -130; // 困率 困摹 
} 
timeoutNextCheck = 500; 
if (yMenuFrom != yMenuTo) { 
yOffset = Math.ceil(Math.abs(yMenuTo - yMenuFrom) / 20); 
if (yMenuTo < yMenuFrom) 
yOffset = -yOffset; 
if (isNS4) 
divMenu.top += yOffset; 
else if (isDOM) 
divMenu.style.top = parseInt (divMenu.style.top, 10) + yOffset; 
timeoutNextCheck = 10; 
} 
setTimeout ("moveRightEdge()", timeoutNextCheck); 
} 
					
if (isNS4) { 
var divMenu = document["divMenu"]; 
divMenu.top = top.pageYOffset +10; 
divMenu.visibility = "visible"; 
moveRightEdge(); 
} else if (isDOM) { 
var divMenu = getRef('divMenu'); 
divMenu.style.top = (isNS ? window.pageYOffset : document.body.offsetHeight) -300; 
divMenu.style.visibility = "visible"; 
moveRightEdge(); 
}