var w3cdom = (document.createElement && document.getElementsByTagName);

var navi_norm = new Array();
var navi_high = new Array();

window.onload = init;

function init()
{
	if (!w3cdom) return;
	
	var nav = document.getElementById('navigation');
	var images = nav.getElementsByTagName('img');
	for (var i=0;i<images.length;i++)
	{
		if (!images[i].name) {
			images[i].onmouseover = highlight_navi;
			images[i].onmouseout = unhighlight_navi;
			var suffix = images[i].src.substring(images[i].src.lastIndexOf('.'));
			navi_norm[i] = new Image();
			navi_norm[i].src = images[i].src;
			navi_high[i] = new Image();
			navi_high[i].src = images[i].src.substring(0,images[i].src.lastIndexOf('.')) + "_hi" + suffix;
		}
		images[i].number = i;
	}
}

function highlight_navi()
{
	this.src = navi_high[this.number].src;
}

function unhighlight_navi()
{
	this.src = navi_norm[this.number].src;
}