// Script to highlight active navigation button.
getImgBase = function(source) {
	var start = source.indexOf('btn');
	var end = source.indexOf('.gif');
	var name = source.substring(start, end);
	var dash = name.lastIndexOf('-');
	var base = name.substring(0, dash + 1);
	return base;
}

getImgPath = function(source) {
	var end = source.indexOf('btn');
	var path = source.substring(0, end);
	return path;
}

getCurrentState = function(source) {
	var start = source.lastIndexOf('-');
	var end = source.indexOf('.gif');
	var state = source.substring(start + 1, end);
	return state;
}

$(document).ready(function() {
	$("a.nav img").hover(function() {		
		var path = getImgPath(this.src);
		var name = getImgBase(this.src);
		state = getCurrentState(this.src);
		$(this).attr('src', path + name + 'on.gif');
	}, function() {		
		var path = getImgPath(this.src);
		var name = getImgBase(this.src);
		if (state == 'off')
		{
			$(this).attr('src', path + name + 'off.gif');
		}
	});
	var loc = document.location;
	$("a.nav").each(function() {
		if (this.href == loc || this.href + 'index.shtml' == loc)
		{
			var image = $(this).children('img')[0];
			var path = getImgPath(image.src);
			var name = getImgBase(image.src);
			$(image).attr('src', path + name + 'on.gif');
		}				   
	});
});