(function($){

	$.fn.diapoPager = function(o) {
		var defaults_options = {
			
			s:{ //selector
				menu: '> ul',
				menu_elements: '> ul li',
				pager: '.pager',
				next: '.pager .next',
				prev: '.pager .prev'
			},
			
			opened_group: 0,
			group_w: 0,
			c_w:0,
			grp_menu_pointer:0,
			menu_grp:[],
			
			c: null, //container
			menu: null, //menu
			menu_elements: null, //menu
			p: null, //pager
			prev: null, //prev
			next: null //next
		};
		
		var o = $.extend(defaults_options, o);
		
		return this.each(function() {
			o.c = $(this);
			o.menu = o.c.find(o.s.menu);
			o.menu_elements = o.c.find(o.s.menu_elements);
			o.pager = o.c.find(o.s.pager);
			o.next = o.c.find(o.s.next);
			o.prev = o.c.find(o.s.prev);
			
			o.c_w = o.menu.innerWidth();
			o.menu_grp[0] = [];
			
			init();
		});
		function init(){
			o.menu_elements.each(function(){
				var li_w = $(this).outerWidth();
				if(o.group_w + li_w > o.c_w) {
					o.group_w = 0;
					o.grp_menu_pointer++;
					o.menu_grp[o.grp_menu_pointer] = [];
				} else {
					o.group_w += li_w;
				}
				if($(this).find('a').attr('class')=='o') {
					o.opened_group = o.grp_menu_pointer;
				}
				o.menu_grp[o.grp_menu_pointer].push($(this));
			});
			
			if(o.menu_grp.length>1) {
				showPager();
			}
		}
		function showPager() {
			o.pager.show();
			refreshPager();
		}
		function refreshPager() {
			//prev pager
			if(o.opened_group>0) {
				o.prev.addClass('active').unbind('click').bind('click',previous);
			} else {
				o.prev.removeClass('active').unbind('click');
			}
			
			if( (o.opened_group+1) < o.menu_grp.length ) {
				o.next.addClass('active').unbind('click').bind('click',next);
			} else {
				o.next.removeClass('active').unbind('click');
			}
			
			o.menu_elements.hide();
			$(o.menu_grp[o.opened_group]).each(function(i,e){
				$(e).show();
			});
			//alert('current page = ' + (o.opened_group+1) + '/'+ o.menu_grp.length);
		}
		function next(){
			if(o.opened_group+1<o.menu_grp.length) {
				o.opened_group++;
			}
			refreshPager();
		}
		function previous(){
			if(o.opened_group>0) {
				o.opened_group--;
			}
			refreshPager();
		}
	};


})(jQuery);



$('.sub-menu').diapoPager();