// IE 
if(document.all){ 
$height = document.body.clientHeight;
$width = document.body.clientWidth;
$top = ($height - 526)/2;
$left = ($width - 780)/2;
document.writeln("<style type='text/css'><!--");
if($top <= 0){
document.writeln(".web{position:absolute;top:5px;left:5px;}");
} else{
document.writeln(".web{position:absolute;top:" + $top + "px;left:" + $left + "px;}");
}
document.writeln("--></style>");
} 
// DOM
else if(document.layers || document.getElementById){ 
$height = window.innerHeight;
$width = window.innerWidth;
$top = ($height - 526)/2;
$left = ($width - 780)/2;
document.writeln("<style type='text/css'><!--");
if($top <= 0){
document.writeln(".web{position:absolute;top:10px;left:5px;}");
} else{
document.writeln(".web{position:absolute;top:" + $top + "px;left:" + $left + "px;}");
}
document.writeln("--></style>");
}