var menuImages = new Array();

function preloadImages() {
 menuImages['menuPortfolioOver'] = new Image();
 menuImages['menuPortfolioOver'].src = "images/menuPortfolioOver.gif";
 menuImages['menuPortfolio'] = new Image();
 menuImages['menuPortfolio'].src = "images/menuPortfolio.gif";

 menuImages['menuWhoOver'] = new Image();
 menuImages['menuWhoOver'].src = "images/menuWhoOver.gif";
 menuImages['menuWho'] = new Image();
 menuImages['menuWho'].src = "images/menuWho.gif";

 menuImages['menuServicesOver'] = new Image();
 menuImages['menuServicesOver'].src = "images/menuServicesOver.gif";
 menuImages['menuServices'] = new Image();
 menuImages['menuServices'].src = "images/menuServices.gif";

 menuImages['menuContactOver'] = new Image();
 menuImages['menuContactOver'].src = "images/menuContactOver.gif";
 menuImages['menuContact'] = new Image();
 menuImages['menuContact'].src = "images/menuContact.gif";
}

function doOver(what) {
 document.getElementById(what).src = menuImages[what + 'Over'].src;
}

function doOut(what) {
 document.getElementById(what).src = menuImages[what].src;
}