function nextImage() {
	if( current_image < ( home_gallery.length - 1 ) ) {
		var new_img = current_image + 1;
		changeImage( new_img );
		current_image = new_img;
	}

	//  Update the arrows.
	updateArrows();
}

function prevImage() {
	if( current_image > 0 ) {
		var new_img = current_image - 1;
		changeImage( new_img );
		current_image = new_img;
	}

	//  Update the arrows.
	updateArrows();
}

function autoNext() {
	if( current_image < ( home_gallery.length - 1 ) ) {
		var new_img = current_image + 1;
		changeImage( new_img );
		current_image = new_img;
	} else {

		//  Start over.
		changeImage( 0 );
		current_image = 0;
	}

	//  Update the arrows.
	updateArrows();
}

function changeImage( num ) {

	//  Description.
	$('#image_description').html( home_gallery[ num ][1] );
	$('#main_image').attr( 'title', home_gallery[ num ][2] );

	//  Image number.
	$('#img_number').html( ( num + 1 ) );

	//  Image fade.
	$('#main_image').fadeOut('slow', function() {
		$('#main_image').attr( 'src', home_gallery[ num ][0].src );
		$('#main_image').fadeIn( 'slow' );
	});
}

function updateArrows() {
	if( current_image == 0 ) {
		$('#gallery_controls_left').attr( 'src', '/images/galarrow_lf_off.gif' );
	}
	if( current_image > 0  )  {
		$('#gallery_controls_left').attr( 'src', '/images/galarrow_lf_on.gif' );
	}
	if( current_image < ( home_gallery.length - 1 ) )  {
		$('#gallery_controls_right').attr( 'src', '/images/galarrow_rt_on.gif' );
	} else {
		$('#gallery_controls_right').attr( 'src', '/images/galarrow_rt_off.gif' );
	}
}