if (document.images) {
	sub_01_on = new Image();				// roll over Images
	sub_01_on.src ="../images/submenu_plumbing01_on.gif";
	sub_02_on = new Image();
	sub_02_on.src ="../images/submenu_plumbing02_on.gif";
	sub_03_on = new Image();
	sub_03_on.src ="../images/submenu_plumbing03_on.gif";




	



	sub_01_off = new Image();				// Original Images
	sub_01_off.src ="../images/submenu_plumbing01_off.gif";
	sub_02_off = new Image();
	sub_02_off.src ="../images/submenu_plumbing02_off.gif";
	sub_03_off = new Image();
	sub_03_off.src ="../images/submenu_plumbing03_off.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");
	}
}