//浮动广告
var xPos = parseInt(window.screen.availWidth*Math.random());
var yPos = parseInt(window.screen.availHeight*Math.random());
var xon = 0;
var yon = 0;
function changePos(obj) 
{
var clientW = window.screen.availWidth-20;
var clientH = window.screen.availHeight-100;
var offsetW = document.getElementById(obj).offsetWidth;
var offsetH = document.getElementById(obj).offsetHeight;
document.getElementById(obj).style.left = xPos + document.body.scrollLeft;
document.getElementById(obj).style.top = yPos + document.body.scrollTop;

if (xon){xPos = xPos + 1;}else{xPos = xPos - 1;}
if (xPos < 0){xon = 1;xPos = 0;}
if (xPos >= (clientW - offsetW)){xon = 0;xPos = (clientW - offsetW);}

if (yon){yPos = yPos + 1;}else {yPos = yPos - 1;}
if (yPos < 0) {yon = 1;yPos = 0;}
if (yPos >= (clientH - offsetH)){yon = 0;yPos = (clientH - offsetH);}
}
function floatAd(obj)
{
window.setInterval("changePos('" + obj + "')","15");
}

//对联广告
var lastScrollY = 0;
function distichAd(obj1,obj2){
var diffY;
if (document.documentElement && document.documentElement.scrollTop)
diffY = document.documentElement.scrollTop;
else if (document.body)
diffY = document.body.scrollTop
else
{/*Netscape stuff*/}
percent=.1*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.getElementById(obj1).style.top = parseInt(document.getElementById(obj1).style.top)+percent+"px";
document.getElementById(obj2).style.top = parseInt(document.getElementById(obj2).style.top)+percent+"px";
lastScrollY=lastScrollY+percent;
}
function initEcAd(obj1,obj2)
{
window.setInterval("distichAd('"+obj1+"','"+obj2+"')",1);
}