New font problem

Hello, as you can see in the attached files, i have a problem after changing my top menu font with a custom cufon font. I have to change its padding.

All i want to change is to make in this css file the following change (see red coloured text):

.mnu_mainmenu > li {
-moz-border-bottom-colors: none;
-moz-border-left-colors: none;
-moz-border-right-colors: none;
-moz-border-top-colors: none;
background: none repeat scroll 0 0 #082442;
border-color: #666666 #666666 -moz-use-text-color -moz-use-text-color;
border-image: none;
border-radius: 0;
border-style: solid solid none none;
border-width: 0 0 medium medium;
line-height: 55px;
margin: 0;
padding: 15px 10px;

But all i get from firebug is this css impakgr.server7.gr/?css_request=1&diff=2094676926 that is generated dynamically and i can't find where to change the padding parameter.

Where can i change it?
Live url is impakgr.server7.gr

it is generated in template_css.php, it is php file but you can juct comment out that whole propert line and put below fixed css code.

Can you send me the exact lines i have to edit?

Found it at the HORIZONTAL section of the template_css.php...!
Thanks!