navImagesHome = new Array(2);
navImagesHome[0] = "./images/nav_home_off.gif";
navImagesHome[1] = "./images/nav_home_on.gif";

navImagesCatering = new Array(2);
navImagesCatering[0] = "./images/nav_catering_off.gif";
navImagesCatering[1] = "./images/nav_catering_on.gif";

navImagesJobs = new Array(2);
navImagesJobs[0] = "./images/nav_job_off.gif";
navImagesJobs[1] = "./images/nav_job_on.gif";

navImagesMailing = new Array(2);
navImagesMailing [0] = "./images/nav_mailing_off.gif";
navImagesMailing [1] = "./images/nav_mailing_on.gif";

navImages = [navImagesHome, navImagesCatering, navImagesJobs, navImagesMailing];

function imageRollover(imageObject, navItem, onOff){
    imageObject.src=navImages[navItem][onOff];
}