Help for js submenu

Hi
guys
I have problem in submenu posion.
I used milonic js for drop down menu.
I used mages for that. But now i Have problem that

In nav last button has dropdown but because of long (in width )images that
subnenu goes out of design table. So i Want to show that submenu in design.
For that I used offset property and got it what I want.

But problem created that when we resize browser that submenu also goes far left because of offset.

So what can i Do for that submenu? It remain in design without using offset.

please help……

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