left border of main menu

Hi, good afternoon.
I´m working with Yourshop template, in joomla 2.5.
I shortened the main menu and aligned it floating to right. I realized there is no left border for the menu if you work with blue or red template colors. There is a left border for the menu only if you use green color.

I would like to work with blue color template. Please, could you tell me how can I draw the left border for the main menu?
Thank you very much in advance.
Yours sincerely,
Elvira.

This demands some small file customzation, please look at file :

[url]templates/gk_yourshop/images/style3/menu_bg.png[/url]

and then add in this file top border radius like it is done in

[url]templates/gk_yourshop/images/style1/menu_bg.png[/url]

I fixed it drawing the border in "menu_bg.png" with photoshop!!
Thank you very much for your help!