$(document).ready(function() {
	var promotionMenuStepBlock = 4;
	var promotionMenuStepH = $('#promotions-menu-tabs li').outerHeight();
	var promotionMenuStepNum = $('#promotions-menu-tabs ul li').index($('#promotions-menu-tabs ul li').last());
		if(promotionMenuStepNum<promotionMenuStepBlock) {$('#promotions-menu-next').addClass('disabled');}
	var promotionMenuStepMax = '-'+(((promotionMenuStepNum+1) * promotionMenuStepH)-(4*promotionMenuStepH))+'px';	
	
	$('#promotions-big').scrollable({circular: true, speed: 800,
		onBeforeSeek:  function(event, tabIndex) {
			if(tabIndex>(promotionMenuStepBlock-1) && tabIndex<(promotionMenuStepNum+1) && tabIndex!=0) {
				$('#promotions-menu-tabs ul').animate({top: '-'+(promotionMenuStepH*(tabIndex-promotionMenuStepBlock+1))},200,'linear');
				$('#promotions-menu-prev').removeClass('disabled');
				}
			else if(tabIndex==(promotionMenuStepNum+1)) {
				$('#promotions-menu-tabs ul').animate({top: '0'},200,'linear');
				$('#promotions-menu-prev').addClass('disabled');
				$('#promotions-menu-next').removeClass('disabled');
				}
			else if(tabIndex==promotionMenuStepNum) {	$('#promotions-menu-next').addClass('disabled'); }

		//	$('#slider-info').html(promotionMenuStepNum+'->'+tabIndex);
			
		}}).navigator({navi: "#promotions-menu-tabs ul"}).autoscroll({ interval: 5000, autoplay: true, autopause: true });
	var api = $("#promotions-big").data("scrollable");


	$('#promotions-menu-next').click(function(){
		if(!$(this).hasClass('disabled') && !$(this).hasClass('inactive')) { 
			$('#promotions-menu-prev').addClass('inactive');
			$('#promotions-menu-next').addClass('inactive');
			$('#promotions-menu-tabs ul').animate({top: '-='+promotionMenuStepH},200,'linear',function() {
				if($('#promotions-menu-tabs ul').css('top')==promotionMenuStepMax) {$('#promotions-menu-next').addClass('disabled'); }
					$('#promotions-menu-prev').removeClass();			
					$('#promotions-menu-next').removeClass('inactive');
			});
		}
	});
	$('#promotions-menu-prev').click(function(){
		if(!$(this).hasClass('disabled') && !$(this).hasClass('inactive')) { 
			$('#promotions-menu-prev').addClass('inactive');
			$('#promotions-menu-next').addClass('inactive');
			$('#promotions-menu-tabs ul').animate({top: '+='+promotionMenuStepH},200,'linear',function() {
				if($('#promotions-menu-tabs ul').css('top')=='0px') {$('#promotions-menu-prev').addClass('disabled'); }
				if(promotionMenuStepNum>(promotionMenuStepBlock-1)) { $('#promotions-menu-next').removeClass('disabled'); }				
				$('#promotions-menu-prev').removeClass('inactive');
				$('#promotions-menu-next').removeClass('inactive');
				});
		}
	});
	
});