DIV水平垂直居中

主要代码：
position:absolute;
top:50%;
left:50%;
margin-top:-(height/2);
margin-left:-(width/2)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>已知宽高度DIV垂直水平居 - www.aspxhome.com</title> <style type="text/css">  </style> </head> <body> <div style="950px; margin:0 auto"> <div class="main">已知宽高度DIV垂直水平居</div> </div> </body> </html>