// Preload Main Navigation

var revert = new Array();
var imgnames = new Array('about','portfolio','research','resume','bullet-musings','bullet-2D','bullet-3D','bullet-games','bullet-pfPDF','bullet-mm','bullet-pitti','bullet-rPDF');

if (document.images) {
  var flipped = new Array();
  // for the 4 main navs
  for(i=0; i< 4; i++) {
	flipped[i] = new Image();
	flipped[i].src = "nav_"+imgnames[i]+"2.gif";
  }
  // all sub navs only roll over the bullet
  for(i=4; i< imgnames.length; i++) {
	flipped[i] = new Image();
	flipped[i].src = "nav_bullet2.gif";
  }
}

function over(num) {
  if(document.images) {
	revert[num] = document.images[imgnames[num]].src;
	document.images[imgnames[num]].src = flipped[num].src;
  }
}
function out(num) {
  if(document.images) document.images[imgnames[num]].src = revert[num];
}