[語法問題]20點!!!!!mouse掂住d link時個link會上下掉轉

有無咩語法係可以令到係xanga度,個mouse掂住d link時(例:add comment/profile pictures)個link會上下掉轉?

我有個語法係可以令到佢左右掉轉:
< style type="text/css" >
a: hover { filter:fliph;height: 1; }
< / style >


但係點轉都轉唔到上下掉轉!
唔該教教我!!