function keyPressHandler(e) {
	if (e.keyCode == 27)
	{
		if (dojo.byId('background_element') != null)
			dojo.byId('background_element').style.display = 'none';
	}

	if ((typeof(photos) != "undefined") && (typeof(photo_index) != "undefined") && (photos != []))
	{
		if (e.keyCode == 37)
		{
			if (photo_index > 0)
			{
				photo_index--;
				SetImage(photo_index);
			}
		}
		if (e.keyCode == 39)
		{
			if (photo_index < (photos.length - 1))
			{
				photo_index++;
				SetImage(photo_index);
			}
		}
	}

	if ((typeof(pdf_images) != "undefined") && (typeof(pdf_image_index) != "undefined") && (pdf_images != []))
	{
		if (e.keyCode == 37)
			pdf_setPdf('pred');
		else
		if (e.keyCode == 39)
			pdf_setPdf('next');
	}
}