if (document.images) {
	var navmax=7;
	var imgOn = new Array(navmax+1);
	var imgOff = new Array(navmax+1);
	for(var n=1;n<=navmax;n++) {
		imgOn[n] = new Image();
		imgOff[n] = new Image();
		imgOn[n].src = "images/sitewide/nav_" + n + "_on.png";
		imgOff[n].src = "images/sitewide/nav_" + n + "_off.png";
	}
}

function changeImg(linkState,linkSrc) {
	if (linkState) {
		if (document.images) document.images["nav" + linkSrc].src=imgOn[linkSrc].src;
	} else {
		if (document.images) document.images["nav" + linkSrc].src=imgOff[linkSrc].src;
	}
}