modify wordpress wp_nav_menu url

How could I change the code generated by wp_nav_menu?

Right now it generates:

<ul cl开发者_StackOverflow中文版ass="rounded ">
<li class="arrow"><a href="http://diner.mobileversion.co/menus/">Menus</a></li>
</ul>

I'd like it to look like this:

<ul class="rounded ">
<li class="arrow"><a href="/#menus/">Menus</a></li>
</ul>

i found this link, but could not get it working properly.

http://wordpress.org/support/topic/how-do-i-modify-wp_nav_menu-link-hrefs?replies=2

The link from support forum doesn't talk about the version number of the wordpress that he is using. I am currently on 3.2.1, it is having the menu options under Appearance section. You can check out this awesome post on menus. It gives you an option of modifying the href as well.

I hope you are on version > 3. If not possible to update then it has to be done using wp functions.