function fadeArrows() {
	var timeId=$("#timeSelect").attr("selectedIndex");

	if (timeId == 0) {
		$('#previous').fadeTo(0, 0.5);
	} else {
		$('#previous').fadeTo(0, 1);
	}

	if (timeId == $('#timeSelect option').size() - 1) {
		$('#next').fadeTo(0, 0.5);
	} else {
		$('#next').fadeTo(0, 1);
	}
}

function previousImage() {
	var timeId=$("#timeSelect").attr("selectedIndex");

	if (timeId == 0)
		return;

	$("#timeSelect").attr('selectedIndex', timeId - 1);
	$("#timeSelect").trigger('change');
}

function nextImage() {
	var timeId=$("#timeSelect").attr("selectedIndex");

	if (timeId == $('#timeSelect option').size() - 1)
		return;

	$("#timeSelect").attr('selectedIndex', timeId + 1);
	$("#timeSelect").trigger('change');
}


// Click effect
$("#previous").live("mousedown", function() {
      $("#previous").attr("src","/images/arrow-left-click.png");
});
$("#previous").live("mouseup", function() {
      $("#previous").attr("src","/images/arrow-left.png");
});

$("#next").live("mousedown", function() {
      $("#next").attr("src","/images/arrow-right-click.png");
});
$("#next").live("mouseup", function() {
      $("#next").attr("src","/images/arrow-right.png");
});