Is it possible to convert the menu into a vertical menu?

Hello, I'm using the miniCMS to build a Website which will have over 15 pages. I'm currently using the default menu template which spans the menu horizontally from left to right. The problem is that once it reaches the right side of the page, it then places the next menu link on the line underneath it.

I would like to place the menu on the left side of the page, spanning from top to bottom. This way I can continue to add more pages and maintain a professional appearance. The only downside is that visitors would have to scroll down to see the entire menu but it would still be an improvement.

If this is possible, would you be able to post the code if it's not too much trouble or let me know exactly what needs to be changed?

Thanks.

If you open CSS file, you will see that there is a /* MENU VERTICAL */ section, is not documented yet, but is simple to use, in template file, change
<div id="navcontainer"> to <div id="navcontainer_vert"> and menu will be vertical.