if (document.images) {            // Active Images

		img1_on = new Image();
		img1_on.src = "images/button_aboutme_on.gif";         
		img2_on = new Image();
		img2_on.src = "images/button_projects_on.gif";         
		img3_on = new Image();
		img3_on.src = "images/button_customers_on.gif";         
		img4_on = new Image();
		img4_on.src = "images/button_services_on.gif";         
		img5_on = new Image();
		img5_on.src = "images/button_products_on.gif";         
		img6_on = new Image();
		img6_on.src = "images/button_contact_on.gif";         

  		img1_off = new Image();
		img1_off.src = "images/button_aboutme_off.gif";
  		img2_off = new Image();
		img2_off.src = "images/button_projects_off.gif";
  		img3_off = new Image();
		img3_off.src = "images/button_customers_off.gif";
  		img4_off = new Image();
		img4_off.src = "images/button_services_off.gif";
  		img5_off = new Image();
		img5_off.src = "images/button_products_off.gif";
  		img6_off = new Image();
		img6_off.src = "images/button_contact_off.gif";

}


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

        }

}

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

        }
}