if (document.images) {
	roll_01_on = new Image();				// Active Images
	roll_01_on.src ="../images/submenu_2_b.gif";
	roll_02_on = new Image();
	roll_02_on.src ="../images/submenu_3_b.gif";
	roll_03_on = new Image();
	roll_03_on.src ="../images/submenu_4_b.gif";
	roll_04_on = new Image();
	roll_04_on.src ="../images/submenu_5_b.gif";
	roll_05_on = new Image();
	roll_05_on.src ="../images/submenu_6_b.gif";
	roll_06_on = new Image();
	roll_06_on.src ="../images/submenu_8_b.gif";
	roll_07_on = new Image();
	roll_07_on.src ="../images/submenu_9_b.gif";
	roll_08_on = new Image();
	roll_08_on.src ="../images/submenu_10_b.gif";
	roll_09_on = new Image();
	roll_09_on.src ="../images/submenu_11_b.gif";
	roll_10_on = new Image();
	roll_10_on.src ="../images/submenu_12_b.gif";
	roll_11_on = new Image();
	roll_11_on.src ="../images/submenu_13_b.gif";
	roll_12_on = new Image();
	roll_12_on.src ="../images/submenu_15_b.gif";
	roll_13_on = new Image();
	roll_13_on.src ="../images/submenu_16_b.gif";
	roll_14_on = new Image();
	roll_14_on.src ="../images/submenu_17_b.gif";
	roll_15_on = new Image();
	roll_15_on.src ="../images/submenu_18_b.gif";
	roll_16_on = new Image();
	roll_16_on.src ="../images/submenu_20_b.gif";



	roll_01_off = new Image();				// Inactive Images
	roll_01_off.src ="../images/submenu_2.gif";
	roll_02_off = new Image();
	roll_02_off.src ="../images/submenu_3.gif";
	roll_03_off = new Image();
	roll_03_off.src ="../images/submenu_4.gif";
	roll_04_off = new Image();
	roll_04_off.src ="../images/submenu_5.gif";
	roll_05_off = new Image();
	roll_05_off.src ="../images/submenu_6.gif";
	roll_06_off = new Image();
	roll_06_off.src ="../images/submenu_8.gif";
	roll_07_off = new Image();
	roll_07_off.src ="../images/submenu_9.gif";
	roll_08_off = new Image();
	roll_08_off.src ="../images/submenu_10.gif";
	roll_09_off = new Image();
	roll_09_off.src ="../images/submenu_11.gif";
	roll_10_off = new Image();
	roll_10_off.src ="../images/submenu_12.gif";
	roll_11_off = new Image();
	roll_11_off.src ="../images/submenu_13.gif";
	roll_12_off = new Image();
	roll_12_off.src ="../images/submenu_15.gif";
	roll_13_off = new Image();
	roll_13_off.src ="../images/submenu_16.gif";
	roll_14_off = new Image();
	roll_14_off.src ="../images/submenu_17.gif";
	roll_15_off = new Image();
	roll_15_off.src ="../images/submenu_18.gif";
	roll_16_off = new Image();
	roll_16_off.src ="../images/submenu_20.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");
	}
}