Sub-site Icon: The icons shown on the project front page allow the user to enter the individual itinerary sites contained within the project.
	Home Icon: This icon appears on each itinerary site's content pages. Clicking on this icon will take the user to the itinerary site's introduction page. From this introduction page, the user can go back to the project main page or to any of the otehr itinerary sites.
	Crossing Icon: This icon appears on each itinerary site's content pages. Clicking on this icon will pop up a map showing the user the location of a "path crossing" – an intersection of two itineraries. Clicking the smaller crossing icon within the pop-up map will open a new window containing the itinerary which has been crossed by that currently browsed by the user.
	Map-it Icon: This icon appears on each itinerary site's content pages. Clicking on this icon will pop up a map showing the user the content page's physical location within St. Petersburg. Clicking on the arrow within the map allows the user to zoom in, showing the precise location at street level.