/**/
.mydiv {
color:#FFFFFF;

text-align: center;

font-size: 12px;
font-weight: bold;
z-index:99;
width: 935px;
min-height:100px;
left:30%;/*FF IE7*/
top: 30%;/*FF IE7*/

margin-left:-150px!important;/*FF IE7 该值为本身宽的一半 */
margin-top:-120px!important;/*FF IE7 该值为本身高的一半*/

margin-top:0px;

position:fixed!important;/*FF IE7*/
position:absolute;/*IE6*/

_top:       expression(eval(document.compatMode &&
            document.compatMode=='CSS1Compat') ?
            documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
            document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/

}

.mydiv p{ line-height:1.5;}
.bg {
background-color: #ccc;
width: 100%;
height: 100%;
left:0;
top:0;/*FF IE7*/
filter:alpha(opacity=50);/*IE*/
opacity:0.5;/*FF*/
z-index:1;

position:fixed!important;/*FF IE7*/
position:absolute;/*IE6*/

_top:       expression(eval(document.compatMode &&
            document.compatMode=='CSS1Compat') ?
            documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
            document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/

}
.mydiv .l{ float:left; width:816px;margin-left:30px;margin-top:20px;text-align:left;}
.mydiv .r{ float:right; margin-right:30px; margin-top:20px;}
/*The END*/