怎样使一个层垂直居中于浏览器中
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh" lang="zh"><head profile="http://www.w3.org/2000/08/w3c-synd/#"><meta http-equiv="content-language" content="zh-cn" /><meta http-equiv="content-type" content="text/html;charset=gb2312" /><title>blueidea</title><style type="text/css">/*<!]>*/</style></head><body><div>web标准常见问题大全</div></body></html>
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