jQuery.preloadImages = function()
{
  for(var i = 0; i<arguments.length; i++)
  {
    jQuery("<img>").attr("src", arguments[i]);
  }
}

$.preloadImages("/site_media/images/map-australia.gif",
	"/site_media/img/map-australia-nsw.gif",
	"/site_media/img/map-australia-nt.gif",
	"/site_media/img/map-australia-qld.gif",
	"/site_media/img/map-australia-sa.gif",
	"/site_media/img/map-australia-tas.gif",
	"/site_media/img/map-australia-vic.gif",
	"/site_media/img/map-australia-wa.gif");

$(document).ready(function(){
	$('#nav-map li a, area').mouseover(function(event){
		var rolloverClass = $(this).attr('class');
		var imgSrc = '/site_media/img/map-australia-'+rolloverClass+'.gif'
		$('img#image-map').attr('src',imgSrc);		
	});
});