//图片按比例缩放
var flag=false;
function DrawImage(ImgD,iwidth,iheight){
var image=new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0){
flag=true;
if(image.width/image.height>= iwidth/iheight){
if(image.width>iwidth){
ImgD.width=iwidth;
ImgD.height=(image.height*iwidth)/image.width;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
//ImgD.alt=image.width+"×"+image.height;
}
else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
//ImgD.alt=image.width+"×"+image.height;
}
}
rightBottomAd()
}

function rightBottomAd()
{ 
var menuYloc = $("#ad").offset().top; 
$(window).scroll(function (){ 
var offsetTop = menuYloc + $(window).scrollTop() +"px"; 
$("#ad").animate({top : offsetTop },{ duration:100 , queue:false }); 
}); 
}

//window.load=DrawImage($("iimm"),120);
//window.load=rightBottomAd();