$(document).ready(function() {
	var $gl = 4; 
	$("#gallery .glp").hide();
	$("#gallery .gl1, #gallery .gl2, #gallery .gl3, #gallery .gl4").show();
	$("#gallery .next").click(function(){
		if($gl < Number($("input#tgl").val())) { 
			$gl = $gl + 1;
			$next = $gl;
			$prev = Math.abs($gl - 4);
			$("#gallery .gl"+$prev).hide(/* "fast" */);
			$("#gallery .gl"+$next).show(/* "slow" */);
			return false;
		}
	});
	
	$("#gallery .prev").click(function(){
		if($gl > 4) { 
			$next = $gl;
			$prev =  Math.abs($gl - 4);
			$("#gallery .gl"+$next).hide(/* "fast" */);
			$("#gallery .gl"+$prev).show(/* "slow" */);
			$gl = $gl - 1;
			return false;
		}
	});
});