Link not clickable in Chrome and Firefox, but clickable in Opera and IE

I'm programming a custom Theme for a wordpress blog ( http://www.ub.edu/areintra/ ) and I have a problem: With Firefox and Chrome I can't click the two right top links ("Inici Facultat", "Inici UB"), but with IE and Opera this problem don't happens.

The CSS is not开发者_如何学C very clean but in any case, i think this problem is so strange...

any idea?

thanks in advance :) .

This is't really a WordPress related question. Anyway. It seems like your header element lies beneath your wrapper element. But I don't understand why you have structured your HTML and CSS this way, seems unnecessary. Try to change z-index for your wrappers.

#header, #wrapper1 { float: left; } solves it. Anyway, it's not a wp Question.