vertical alignment and floats

[yacc]

I'm sorry if my question seems stupid, but I spent too much time on this. I have a div display block containing two span, one on the right and the other one on the left.\[code\]<div class="user-bar"> <span class="username">Martin GOYOT</span> <span class="user-options"><input type="button" class="disconnect" value="http://stackoverflow.com/questions/14076845/d