Output Post ID for all nav_items

html mark up for navigation will look like this 

<ul id="menu-res" class="main-menu"><li id="menu-item-72" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-72"><a href="#home">Home</a></li>
   <li id="menu-item-238" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-238"><a href="#services">Services</a></li>
   <li id="menu-item-73" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-73"><a href="#about">About</a></li>
   <li id="menu-item-75" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-75"><a href="#skills">Skills</a></li>
   <li id="menu-item-346" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-346"><a href="http://www.yourstorepick.com/pro-site/">Pro Site</a></li>
   <li id="menu-item-347" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-347"><a href="http://www.yourstorepick.com/wp-signup.php?pro-site=1">Sign up</a></li>
   <li id="menu-item-74" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-74"><a href="#our-team">Our Team</a></li>
   <li id="menu-item-239" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-239"><a href="#our-work">Our Work</a></li>
   <li id="menu-item-236" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-236"><a href="#blog">Blog</a></li>
   <li id="menu-item-237" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-237"><a href="#contact">Contact</a></li>
</ul>

From above code you can see that each li has unique ID, in this menu-item-XXX is a format of ID. menu-item- will be same and XXX will vary. You can extract this ID.

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