function cacheImages() {
  var imgs = new Array();
  for (var i = 0; i < img_names.length; i++) {
    imgs[i] = new Image();
    imgs[i].src = 'graphics/nav/' + img_names[i] + '_over.gif';
  }
}

function swapImage(newImg) {
		document.getElementById('bigimg').className = "hide";
		document.getElementById('bigimg').src = "";
		document.getElementById('bigimg').src = "images/portfolio/large/"+newImg+".jpg";
}

function validate(form) {
	var valid = true;
	for (var i=0; i<form.length; i++) {
		if (form[i].value.length == 0) {
				valid = false;
		}
	}
	if (valid) {
		return true;
	} else {
		alert('ALL fields must be filled in. Thank you.')
		return false;
	}
}