/* For each new image that will have a rollover effect:
   1. there will be 2 entries within the 'if' statement below
   2. apply the 'swapImage()' calls to the linked image in the page
      (look at main nav for example of how to use the 'swapImage()' calls)
*/

// preloads the images for the rollover effect
if( document.images )
{
	btn_home = new Image;
	btn_home.src = "images/navigation/btn_home.gif";
	btn_home_o = new Image;
	btn_home_o.src = "images/navigation/btn_home_o.gif";
	btn_safaris = new Image;
	btn_safaris.src = "images/navigation/btn_safaris.gif";
	btn_safaris_o = new Image;
	btn_safaris_o.src = "images/navigation/btn_safaris_o.gif";
	btn_programs = new Image;
	btn_programs.src = "images/navigation/btn_programs.gif";
	btn_programs_o = new Image;
	btn_programs_o.src = "images/navigation/btn_programs_o.gif";
	btn_africa = new Image;
	btn_africa.src = "images/navigation/btn_africa.gif";
	btn_africa_o = new Image;
	btn_africa_o.src = "images/navigation/btn_africa_o.gif";
	btn_about = new Image;
	btn_about.src = "images/navigation/btn_about.gif";
	btn_about_o = new Image;
	btn_about_o.src = "images/navigation/btn_about_o.gif";
	btn_catalog = new Image;
	btn_catalog.src = "images/navigation/btn_catalog.gif";
	btn_catalog_o = new Image;
	btn_catalog_o.src = "images/navigation/btn_catalog_o.gif";
	btn_media = new Image;
	btn_media.src = "images/navigation/btn_media.gif";
	btn_media_o = new Image;
	btn_media_o.src = "images/navigation/btn_media_o.gif";
	btn_merch = new Image;
	btn_merch.src = "images/navigation/btn_merch.gif";
	btn_merch_o = new Image;
	btn_merch_o.src = "images/navigation/btn_merch_o.gif";
}

// switches an image's source file
function swapImage( whichImage, newImage )
{
	if( document.images )
	{
		document[whichImage].src = eval( newImage + ".src" );
	}
}