var preload = function () {

	//Highlight current page
	var navThis = getElement('thisPage').innerHTML;
	if ( navThis )
		setNav ( navThis );
	
	//Preload images
	var arrPreload = [ 'image/button/on.gif', 'image/intro/button/on.gif' ];
	var arrOver = new Array();
	
	for(var i = 0; i < arrPreload.length; i++) {
		arrOver[i] = new Image();
		arrOver[i].src = arrPreload[i];
	}
}

var setNav = function (navThis) {
	if ( navThis == 'about' ) {
		getElement('about').style.backgroundImage = 'url("../image/intro/button/on.gif")';
	} else {
		getElement(navThis).style.backgroundImage = 'url("../image/button/on.gif")';
	}
}

//onload event
connect(window, 'onload', preload);