blue underline in Firefox Browser

Hi,i am from germany.
I´ve got a problem by creating a "back" button into the imageview.tpl.php
The code is like this:

-104

zurueck

THe button works in IE, but in firefox there´s allways a blue underline under the text.
I´m not really good in english an in programming also not ;))
MAybe it`s easy to correct it.

And thanks for that gallery, its the BEST !!


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