function swapImage(imgName, imageLocation) {
	 document[imgName].src = imageLocation;
}

if (document.images) {

	// top nav
	var timetableOver  = new Image();
	var eventsOver     = new Image();
	var venuesOver     = new Image();
	var galleryOver    = new Image();
	var videosOver     = new Image();
	timetableOver.src  = "templates/brightondancing/images/topnav1_timetable_over.gif";
	eventsOver.src     = "templates/brightondancing/images/topnav1_events_over.gif";
	venuesOver.src     = "templates/brightondancing/images/topnav1_venues_over.gif";
	galleryOver.src    = "templates/brightondancing/images/topnav1_gallery_over.gif";
	videosOver.src     = "templates/brightondancing/images/topnav1_videos_over.gif";

	// header nav
	var ballroomOver   = new Image();
	var tangoOver      = new Image();
	var rocknrollOver  = new Image();
	var salsaOver      = new Image();
	var keepfitOver    = new Image();
	ballroomOver.src   = "templates/brightondancing/images/mainnav2_ballroom_over.gif";
	tangoOver.src      = "templates/brightondancing/images/mainnav2_tango_over.gif";
	rocknrollOver.src  = "templates/brightondancing/images/mainnav2_rocknroll_over.gif";
	salsaOver.src      = "templates/brightondancing/images/mainnav2_salsa_over.gif";
	keepfitOver.src    = "templates/brightondancing/images/mainnav2_keepfit_over.gif";
	
	// footer
	var signupOver     = new Image();
	signupOver.src     = "templates/brightondancing/images/signup_over.gif";
	
	var arrow1    = new Image();
	arrow1.src = "templates/brightondancing/images/arrow_over.gif";
}