$(function() {
		var step = 1; 
		var current = 0; 
		var maximum = $('#my_carousel ul li').size(); 
		var visible = 1; 
		var speed = 1000; 
		var liSize = 238;
		var carousel_height = 40;
		var ulSize = liSize * maximum;   
		var divSize = liSize * visible;  
		
		$('#my_carousel ul').css("width", ulSize+"px").css("left", -(current * liSize)).css("position", "absolute");

		$('#my_carousel').css("width", divSize+"px").css("height", carousel_height+"px").css("visibility", "visible").css("overflow", "hidden").css("position", "relative"); 
		
		$('.btnprev').click(function() { 
			if(current + step < 0 || current + step > maximum - visible) {return; }
			else {
				current = current + step;
				$('#my_carousel ul').animate({left: -(liSize * current)}, speed, null);
			}
			return false;
		});
		
		$('.btnnext').click(function() { 
			if(current - step < 0 || current - step > maximum - visible) {return; }
			else {
				current = current - step;
				$('#my_carousel ul').animate({left: -(liSize * current)}, speed, null);
			}
			return false;
		});
	});