function rollOn(elem){
if(document.all){
elem.style.background = '#000099';
elem.style.color = '#FFFFFF';
}}

function rollOff(elem){
if(document.all){
elem.style.background= 'transparent';
elem.style.color = '#000000';
}}

function opacityOn(elem){
if(document.all){
elem.filters.alpha.opacity = '100';
}}

function opacityOff(elem){
if(document.all){
elem.filters.alpha.opacity = '70';
}}