How do i ajaxify /Use ajax on Side bar custom menues so that links are loaded to my content div without refreshing page
You can use ajax_pages module.


  Features
  
  
  Works inobtrusively out of the box
  Requires only minimal theme modifications
  Browser address bar updating using HTML5's history.pushState()
  Full page reloading (page_top, page and page_bottom regions)
  Transparently ajaxifies forms, including GET ones Handles redirects
  Loads additional CSS and JS files as required
  JS/CSS preprocessors and aggregation friendly
  Ajax requests are GET and fully cacheable (also with Boost!)