function navOverLoad(images)
{
	$(images).each(function(){
		var src = $(this).attr('src');
		var arr = src.split('.');
		var ext = arr[arr.length - 1];
		var loadSrc = src.replace('.' + ext, '') + '-over.' + ext;
		var img = new Image()
		img.src = loadSrc;
	});
}

function navSwap()
{
	var newSrc = '';
	var src = $(this).children('img').attr('src');
	var arr = src.split('.');
	var ext = arr[arr.length - 1];
	src = src.replace('.' + ext, '');
	
	if(src.indexOf('-over') > -1) {
		src = src.replace('-over','');
		newSrc = src + '.' + ext;	
	} else {
		newSrc = src + '-over.' + ext;
	}
	
	$(this).children('img').attr('src', newSrc);
}