//Preloading images

if (document.images){


	enviro_nav_1 = new Image;
	enviro_nav_1.src = "images/enviro_nav_1.jpg";
	enviro_nav_1_over = new Image;
	enviro_nav_1_over.src = "images/enviro_nav_1_over.jpg";

	enviro_nav_2 = new Image;
	enviro_nav_2.src = "images/enviro_nav_2.jpg";
	enviro_nav_2_over = new Image;
	enviro_nav_2_over.src = "images/enviro_nav_2_over.jpg";

	enviro_nav_3 = new Image;
	enviro_nav_3.src = "images/enviro_nav_3.jpg";
	enviro_nav_3_over = new Image;
	enviro_nav_3_over.src = "images/enviro_nav_3_over.jpg";

	enviro_nav_4 = new Image;
	enviro_nav_4.src = "images/enviro_nav_4.jpg";
	enviro_nav_4_over = new Image;
	enviro_nav_4_over.src = "images/enviro_nav_4_over.jpg";

	enviro_tempnav_1 = new Image;
	enviro_tempnav_1.src = "images/enviro_tempnav_1.jpg";
	enviro_tempnav_1_over = new Image;
	enviro_tempnav_1_over.src = "images/enviro_tempnav_1_over.jpg";

	enviro_tempnav_2 = new Image;
	enviro_tempnav_2.src = "images/enviro_tempnav_2.jpg";
	enviro_tempnav_2_over = new Image;
	enviro_tempnav_2_over.src = "images/enviro_tempnav_2_over.jpg";

	enviro_tempnav_3 = new Image;
	enviro_tempnav_3.src = "images/enviro_tempnav_3.jpg";
	enviro_tempnav_3_over = new Image;
	enviro_tempnav_3_over.src = "images/enviro_tempnav_3_over.jpg";

	enviro_tempnav_4 = new Image;
	enviro_tempnav_4.src = "images/enviro_tempnav_4.jpg";
	enviro_tempnav_4_over = new Image;
	enviro_tempnav_4_over.src = "images/enviro_tempnav_4_over.jpg";


}

// Function to 'activate' images.
function imgSwitch(imgID, imgState){
	if (document.images)
		document.images[imgID].src=eval(imgState + ".src");
}