<style>
#a
{
border:2px solid blue;
height:100px;
100px;
background-color:#0F6;
right:60px;
bottom:70px;
position:fixed;}
.b
{
border:2px solid blue;
height:100px;
100px;
background-color:#0F6;
right:0px;
bottom:0px;
position:absolute;}
.c
{
border:2px solid red;
400px;
height:200px;}
.d
{
border:2px solid red;
400px;
height:200px;
position:absolute;}
#aaa
{
border:2px solid yellow;
background-color:#9F3;
height:100px;
100px;
left:30px;
top:30px;
position:fixed;}
#bbb
{
border:2px solid yellow;
background-color:#9F3;
height:100px;
100px;
left:30px;
top:30px;
position:relative;}
</style>
</head>
<body>
<div id="a">广告招商</div>
<div class="c">c<div class="b">b</div></div>
<div class="d">d<div class="b">bb</div></div>
<div id="aaa">aaa</div>
<div id="bbb">bbb</div>
</body>
<style>
#aaa
{
border:2px solid yellow;
background-color:#9F3;
height:100px;
100px;
left:30px;
top:30px;
position:fixed;
overflow:visible;
}
#bbb
{
border:2px solid yellow;
background-color:#9F3;
height:100px;
100px;
left:60px;
top:60px;
position:relative;}
#ccc
{
border:#0C0 solid 2px;
height:300px;
100px;
float:right;}
#ddd
{
border:#0C0 solid 2px;
height:300px;
100px;
float:left;}
</style>
</head>
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<div id="ccc">广告位置招商</div><div id="ddd">广告位ddd</div><div id="ddd">广告位eee</div><div id="ccc">广告位置招商fff</div>
<!--<div id="aaa">aaa<div id="bbb">bbb</div></div> -->
