if (document.images) {
	roll_01_on = new Image();				// Active Images
	roll_01_on.src ="images/h_nav_products.gif";
	roll_02_on = new Image();
	roll_02_on.src ="images/h_nav_tech.gif";
	roll_03_on = new Image();
	roll_03_on.src ="images/h_nav_company.gif";
	roll_04_on = new Image();
	roll_04_on.src ="images/h_nav_news.gif";



	roll_01_off = new Image();				// Inactive Images
	roll_01_off.src ="images/h_nav_products.gif";
	roll_02_off = new Image();
	roll_02_off.src ="images/h_nav_tech.gif";
	roll_03_off = new Image();
	roll_03_off.src ="images/h_nav_company.gif";
	roll_04_off = new Image();
	roll_04_off.src ="images/h_nav_news.gif";

}

// 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");
	}
}