function swap (imgName,swapTo) {
	document.images[imgName].src = swapTo;
	}
	
function loadImg() {
  if (document.images) {
    var imgFiles = loadImg.arguments;
    if (document.preloadArray==null) document.preloadArray = new Array();
    var i = document.preloadArray.length;
    with (document) for (var j=0; j<imgFiles.length; j++) {
      preloadArray[i] = new Image;
      preloadArray[i].src = imgFiles[j];
  } }
}

function rollover (imgName) {
	s = document.images[imgName];
	if (s.src.indexOf("_over") > 0) {
		s.src = s.src.slice(0,s.src.indexOf("_over")) + s.src.substr(s.src.lastIndexOf("."));
	} else {
		s.src = s.src.slice(0,s.src.lastIndexOf(".")) + "_over" + s.src.substr(s.src.lastIndexOf("."));
	}
} 

function init() {
// size columns
	document.getElementById("content").style.height = (document.getElementById("outer-frame").offsetHeight - 90) + "px";
	
	loadImg('nav/artrequirements_over.gif','nav/contact_over.gif','nav/gallery_over.gif','nav/info_over.gif','nav/whygomobile_over.gif','nav/eventideas_over.gif','nav/truck_whygomobile.gif','nav/truck_gallery.gif','nav/truck_artrequirements.gif','nav/truck_info.gif','nav/truck_contact.gif','nav/truck_eventideas.gif');
}