怎样让div中的img居中
<div>
asdfasfasfasfdasdfdfasfsdf
<img src...>
</div>
文字不居中，仅仅图片居中（非垂直）
[解决办法]
<!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 id="Head1" runat="server"> <title>xxxxxxx</title> <style type="text/css"> <!-- div { text-align:center; width:500px; height:500px; border:1px solid #666666; } div span{ margin:0px; padding:0px; display:block; margin-left:-290px; } --></style></head><body><div> <span>asdfasfasfasfdasdfdfasfsdf</span> <img src="11.jpg"> </di </body></html>