if (document.images) {			  // Active Images
			
			img1on = new Image(); 
			img1on.src = "images/nav_bar/home_on.jpg";
			img2on = new Image(); 
			img2on.src = "images/nav_bar/overview_on.jpg";
			img3on = new Image(); 
			img3on.src = "images/nav_bar/services_on.jpg";
			img4on = new Image(); 
			img4on.src = "images/nav_bar/projects_on.jpg";
			img5on = new Image(); 
			img5on.src = "images/nav_bar/experience_on.jpg";
			img6on = new Image(); 
			img6on.src = "images/nav_bar/safety_on.jpg";
			img7on = new Image(); 
			img7on.src = "images/nav_bar/contact_on.jpg";
	
			img1off = new Image(); 
			img1off.src = "images/nav_bar/home_off.jpg";
			img2off = new Image(); 
			img2off.src = "images/nav_bar/overview_off.jpg";
			img3off = new Image(); 
			img3off.src = "images/nav_bar/services_off.jpg";
			img4off = new Image(); 
			img4off.src = "images/nav_bar/projects_off.jpg";
			img5off = new Image(); 
			img5off.src = "images/nav_bar/experience_off.jpg";
			img6off = new Image(); 
			img6off.src = "images/nav_bar/safety_off.jpg";
			img7off = new Image(); 
			img7off.src = "images/nav_bar/contact_off.jpg";

		}

// Function to 'activate' images.
function imgOn(imgName) {
		if (document.images) {
			document[imgName].src = eval(imgName + "on.src");
		}
}

// Function to 'deactivate' images.
function imgOff(imgName) {
		if (document.images) {
			document[imgName].src = eval(imgName + "off.src");
		}
}