if (document.images) {

    company_off = new Image(); company_off.src = "/images/nav/our-company.gif";
    rentals_off = new Image(); rentals_off.src = "/images/nav/equipment-rentals.gif";
    sales_off = new Image(); sales_off.src = "/images/nav/equipment-sales.gif";
    services_off = new Image(); services_off.src = "/images/nav/services-repairs.gif";
    support_off = new Image(); support_off.src = "/images/nav/who-we-support.gif";

    motorola_off = new Image(); motorola_off.src = "/images/motorola-two-way-radios.gif";
    cellular_off = new Image(); cellular_off.src = "/images/cellular-phones.gif";
    direct_off = new Image(); direct_off.src = "/images/direct-connect-phones.gif";
    modem_off = new Image(); modem_off.src = "/images/portable-modems.gif";
    satellite_off = new Image(); satellite_off.src = "/images/satellite-phones.gif";
    megaphone_off = new Image(); megaphone_off.src = "/images/megaphones.gif";


    
    
    company_on = new Image(); company_on.src = "/images/nav/our-company-on.gif";
    rentals_on = new Image(); rentals_on.src = "/images/nav/equipment-rentals-on.gif";
    sales_on = new Image(); sales_on.src = "/images/nav/equipment-sales-on.gif";
    services_on = new Image(); services_on.src = "/images/nav/services-repairs-on.gif";
    support_on = new Image(); support_on.src = "/images/nav/who-we-support-on.gif";
    
    motorola_on = new Image(); motorola_on.src = "/images/motorola-two-way-radios-on.gif";
    cellular_on = new Image(); cellular_on.src = "/images/cellular-phones-on.gif";
    direct_on = new Image(); direct_on.src = "/images/direct-connect-phones-on.gif";
    modem_on = new Image(); modem_on.src = "/images/portable-modems-on.gif";
    satellite_on = new Image(); satellite_on.src = "/images/satellite-phones-on.gif";
    megaphone_on = new Image(); megaphone_on.src = "/images/megaphones-on.gif";
    
     
    }
    
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "_on.src"); 
						}
}

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