gistfile1.txt

   function getOffset() {
    /* Get the offset for moving the nav */
    var width = $(document).width();
    var margin = (width - 720) / 2;
    var offset = $(".place.display").offset();
    var position = $(".places").css("marginLeft");
    position = parseInt(position.substring(0, position.indexOf("p")));
    
    console.log(position);
    
    if ( margin > offset.left ) {

     if ( position < 0 ) {
      var displacement = (-1 * offset.left) + margin;
      console.log("Rule 3: Behind margin @ " + displacement + "px.");
      return position + displacement;
     } else {
      var displacement =  margin - offset.left;
      console.log("Rule 2: Behind margin @ " + displacement + "px.");
      return position + displacement;
     }
    } else {
     var displacement = offset.left - margin;
     console.log("Rule 1: Ahead of margin @ " + displacement + "px.");
     
     return position - displacement;
    }
   }