if (document.images) {
page_usc_arts_events_roll = new Image();
page_usc_arts_events_roll.src = "images/roll/page_usc_arts_events_roll.gif"; 
page_usc_arts_events_inactive = new Image();
page_usc_arts_events_inactive.src = "images/roll/page_usc_arts_events_inactive.gif";
page_faq_roll = new Image();
page_faq_roll.src = "images/roll/page_faq_roll.gif"; 
page_faq_inactive = new Image();
page_faq_inactive.src = "images/roll/page_faq_inactive.gif";  
page_forum_roll = new Image();
page_forum_roll.src = "images/roll/page_forum_roll.gif"; 
page_forum_inactive = new Image();
page_forum_inactive.src = "images/roll/page_forum_inactive.gif";  
page_contact_roll = new Image();
page_contact_roll.src = "images/roll/page_contact_roll.gif"; 
page_contact_inactive = new Image();
page_contact_inactive.src = "images/roll/page_contact_inactive.gif";
page_guest_roll = new Image();
page_guest_roll.src = "images/roll/page_guest_roll.gif"; 
page_guest_inactive = new Image();
page_guest_inactive.src = "images/roll/page_guest_inactive.gif";
page_enforcement_roll = new Image();
page_enforcement_roll.src = "images/roll/page_enforcement_roll.gif"; 
page_enforcement_inactive = new Image();
page_enforcement_inactive.src = "images/roll/page_enforcement_inactive.gif";
page_transit_roll = new Image();
page_transit_roll.src = "images/roll/page_transit_roll.gif"; 
page_transit_inactive = new Image();
page_transit_inactive.src = "images/roll/page_transit_inactive.gif";
page_public_transit_roll = new Image();
page_public_transit_roll.src = "images/roll/page_public_transit_roll.gif"; 
page_public_transit_inactive = new Image();
page_public_transit_inactive.src = "images/roll/page_public_transit_inactive.gif";
page_special_events_roll = new Image();
page_special_events_roll.src = "images/roll/page_special_events_roll.gif"; 
page_special_events_inactive = new Image();
page_special_events_inactive.src = "images/roll/page_special_events_inactive.gif";

page_sustainability_roll = new Image();
page_sustainability_roll.src = "images/roll/page_sustainability_roll.gif"; 
page_sustainability_inactive = new Image();
page_sustainability_inactive.src = "images/roll/page_sustainability_inactive.gif";  
}

function imgOn(imgName) {

if (document.images) {
document[imgName].src = eval(imgName + "_roll.src");
}
}

function imgOff(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "_inactive.src");
}
}