/**
 * @author tt
 */
var swapImage = function( argv, flag ) {
	var positive = "images/" + argv.id + "_positive.png";
	var negative = "images/" + argv.id + "_negative.png";
	if( flag ) {
		argv.src = positive;
	} else {
		argv.src = negative;
	}
}

var setupMenu = function( now ) {
	var imgArray = document.getElementById("menu").getElementsByTagName("img");
	for (var i = 0; i < imgArray.length; i++) {
		if( now == imgArray[i].id ) {
			imgArray[i].src = "images/" + imgArray[i].id + "_positive.png";
		} else {
			imgArray[i].src = "images/" + imgArray[i].id + "_negative.png";
			imgArray[i].onmouseover = function() { return swapImage(this, true) };
			imgArray[i].onmouseout = function() { return swapImage(this, false) };
		}
	}
}