// Our plugin will be defined within an immediately
// executed method.
(function( $ ) {
   // Default to the current location.
   var strLocation = window.location.href;
   var strHash = window.location.hash;
   var strPrevLocation = "";
   var strPrevHash = "";
    
   // This is how often we will be checkint for
   // changes on the location.
   var intIntervalTime = 100;
    
   // This method removes the pound from the hash.
   var fnCleanHash = function( strHash ) {
      return ( strHash.substring( 1, strHash.length ) );
   }
   
   // This will be the method that we use to check
   // changes in the window location.
   var fnCheckLocation = function() {
      
      // Check to see if the location has changed.
      if( strLocation != window.location.href ) {
          
         // Store the new and previous locations.
         strPrevLocation = strLocation;
         strPrevHash = strHash;
         strLocation = window.location.href;
         strHash = window.location.hash;
          
         // The location has changed. Trigger a
         // change event on the location object,
         // passing in the current and previous
         // location values.
         $( window.location ).trigger( 'change', {
            currentHref: strLocation,
            currentHash: fnCleanHash( strHash ),
            previousHref: strPrevLocation,
            previousHash: fnCleanHash( strPrevHash )
         } );
         
      }
      
   }
   
   window.changeLocation = function( event ) {
      
      $( window.location ).bind( 'change', event );
      
      
   }
   
   // Set an interval to check the location changes.
   setInterval( fnCheckLocation, intIntervalTime );
   
} )( jQuery );