if (document.images) {
	roll_01_on = new Image();				// Active Images
	roll_01_on.src ="../images/about_leftnav_1b.gif";
	roll_02_on = new Image();
	roll_02_on.src ="../images/about_leftnav_2b.gif";
	roll_03_on = new Image();
	roll_03_on.src ="../images/about_leftnav_3b.gif";
	roll_04_on = new Image();
	roll_04_on.src ="../images/about_leftnav_4b.gif";
	roll_05_on = new Image();
	roll_05_on.src ="../images/about_leftnav_5b.gif";
	roll_06_on = new Image();
	roll_06_on.src ="../images/about_leftnav_6b.gif";
	roll_07_on = new Image();
	roll_07_on.src ="../images/about_subnav_1b.jpg";
	roll_08_on = new Image();
	roll_08_on.src ="../images/about_subnav_2b.jpg";
	roll_09_on = new Image();
	roll_09_on.src ="../images/about_subnav_3b.jpg";
	roll_10_on = new Image();
	roll_10_on.src ="../images/practice_subnav_1b.jpg";
	roll_11_on = new Image();
	roll_11_on.src ="../images/practice_subnav_2b.jpg";
	roll_12_on = new Image();
	roll_12_on.src ="../images/practice_subnav_3b.jpg";
	roll_13_on = new Image();
	roll_13_on.src ="../images/media_subnav_1b.jpg";
	roll_14_on = new Image();
	roll_14_on.src ="../images/media_subnav_2b.jpg";
	roll_15_on = new Image();
	roll_15_on.src ="../images/media_subnav_3b.jpg";
	roll_16_on = new Image();
	roll_16_on.src ="../images/media_subnav_4b.jpg";
	roll_17_on = new Image();
	roll_17_on.src ="images/home_menu_1b.jpg";
	roll_18_on = new Image();
	roll_18_on.src ="images/home_menu_2b.jpg";
	roll_19_on = new Image();
	roll_19_on.src ="images/home_menu_3b.jpg";
	roll_20_on = new Image();
	roll_20_on.src ="images/home_menu_4b.jpg";
	roll_21_on = new Image();
	roll_21_on.src ="images/home_menu_5b.jpg";
	roll_22_on = new Image();
	roll_22_on.src ="../images/practice_subnav_4b.jpg";
	roll_23_on = new Image();
	roll_23_on.src ="../images/media_subnav_5b.jpg";
	roll_24_on = new Image();
	roll_24_on.src ="../images/media_subnav_6b.gif";
	roll_25_on = new Image();
	roll_25_on.src ="../images/trans_subnav_1b.jpg";
	roll_26_on = new Image();
	roll_26_on.src ="../images/trans_subnav_2b.jpg";
	roll_27_on = new Image();
	roll_27_on.src ="../images/trans_subnav_3b.jpg";
	roll_28_on = new Image();
	roll_28_on.src ="../images/trans_subnav_4b.jpg";
	roll_29_on = new Image();
	roll_29_on.src ="../images/trans_subnav_5b.jpg";
	roll_30_on = new Image();
	roll_30_on.src ="../images/trans_subnav_6b.jpg";
	roll_31_on = new Image();
	roll_31_on.src ="../images/trans_subnav_7b.jpg";



	roll_01_off = new Image();				// Inactive Images
	roll_01_off.src ="../images/about_leftnav_1a.gif";
	roll_02_off = new Image();
	roll_02_off.src ="../images/about_leftnav_2a.gif";
	roll_03_off = new Image();
	roll_03_off.src ="../images/about_leftnav_3a.gif";
	roll_04_off = new Image();
	roll_04_off.src ="../images/about_leftnav_4a.gif";
	roll_05_off = new Image();
	roll_05_off.src ="../images/about_leftnav_5a.gif";
	roll_06_off = new Image();
	roll_06_off.src ="../images/about_leftnav_6a.gif";
	roll_07_off = new Image();
	roll_07_off.src ="../images/about_subnav_1.jpg";
	roll_08_off = new Image();
	roll_08_off.src ="../images/about_subnav_2.jpg";
	roll_09_off = new Image();
	roll_09_off.src ="../images/about_subnav_3.jpg";
	roll_10_off = new Image();
	roll_10_off.src ="../images/practice_subnav_1.jpg";
	roll_11_off = new Image();
	roll_11_off.src ="../images/practice_subnav_2.jpg";
	roll_12_off = new Image();
	roll_12_off.src ="../images/practice_subnav_3.jpg";
	roll_13_off = new Image();
	roll_13_off.src ="../images/media_subnav_1.jpg";
	roll_14_off = new Image();
	roll_14_off.src ="../images/media_subnav_2.jpg";
	roll_15_off = new Image();
	roll_15_off.src ="../images/media_subnav_3.jpg";
	roll_16_off = new Image();
	roll_16_off.src ="../images/media_subnav_4.jpg";
	roll_17_off = new Image();
	roll_17_off.src ="images/home_menu_1.jpg";
	roll_18_off = new Image();
	roll_18_off.src ="images/home_menu_2.jpg";
	roll_19_off = new Image();
	roll_19_off.src ="images/home_menu_3.jpg";
	roll_20_off = new Image();
	roll_20_off.src ="images/home_menu_4.jpg";
	roll_21_off = new Image();
	roll_21_off.src ="images/home_menu_5.jpg";
	roll_22_off = new Image();
	roll_22_off.src ="../images/practice_subnav_4.jpg";
	roll_23_off = new Image();
	roll_23_off.src ="../images/media_subnav_5.jpg";
	roll_24_off = new Image();
	roll_24_off.src ="../images/media_subnav_6.gif";
	roll_25_off = new Image();
	roll_25_off.src ="../images/trans_subnav_1.jpg";
	roll_26_off = new Image();
	roll_26_off.src ="../images/trans_subnav_2.jpg";
	roll_27_off = new Image();
	roll_27_off.src ="../images/trans_subnav_3.jpg";
	roll_28_off = new Image();
	roll_28_off.src ="../images/trans_subnav_4.jpg";
	roll_29_off = new Image();
	roll_29_off.src ="../images/trans_subnav_5.jpg";
	roll_30_off = new Image();
	roll_30_off.src ="../images/trans_subnav_6.jpg";
	roll_31_off = new Image();
	roll_31_off.src ="../images/trans_subnav_7.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");
	}
}