$(document).ready(function() {
   function filter(string) {
      return string
         .replace(/^\//,'')
         .replace(/(index|default).[a-zA-Z]{3,4}$/,'')
         .replace(/\/$/,'')
   }
   $('a[href*=#]').each(function() {
      if (filter(location.pathname) == filter(this.pathname)
         && location.hostname == this.hostname
	 && this.hash.replace(/#/,'') ) {
	    var $targetId = $(this.hash), $targetAnchor = $('[name=' + this.hash.slice(1) +']');
	    var $target = $targetId.length ? $targetId : $targetAnchor.length ? $targetAnchor : false;
	    if ($target) {
	       var targetOffset = $target.offset().top - 50;
	       $(this).click(function() {
	          $('html, body').animate({scrollTop: targetOffset}, 400);
	          return false;
	        });
            }
         }
      });
   });