var indexView = 0;

function clickNext() {
	$('.gallery img:eq(' + indexView + ')').hide();
	$('.captions span:eq(' + indexView + ')').hide();
	indexView++;
	if ( $('.gallery img:eq(' + indexView + ')').attr('src') ) {
		//next Exists
	} else {  
		//Next doesn't exist
		indexView = 0;
	}
	
	$('.gallery img:eq(' + indexView + ')').show();
	$('.captions span:eq(' + indexView + ')').show();
	
}

function clickBack() {
	$('.gallery img:eq(' + indexView + ')').hide();
	$('.captions span:eq(' + indexView + ')').hide();

	indexView--;
	if ( indexView >= 0 ) {
		//next Exists
	} else {  
		//Next doesn't exist
		indexView = $('.gallery img').length-1;
	}
	
	$('.gallery img:eq(' + indexView + ')').show();
	$('.captions span:eq(' + indexView + ')').show();

}