var homeFunctions ={

	initialize: function() {
		if($('img_show_case')){
			new SlideShow('img_show_case', { duration: 5000, onSlide : function(){  
				homeFunctions.show_arrow();	
			}});
			
			homeFunctions.index = 0;
			homeFunctions.show_left = true;
			homeFunctions.elms = $('sub_menu').getChildren('.level_1');
			homeFunctions.elms[homeFunctions.index].addClass('show_arrow');
		}	
	},
			
	show_arrow : function(){
		remove = homeFunctions.elms[homeFunctions.index];
		remove.removeClass('show_arrow');
		
		if(homeFunctions.show_left){
			homeFunctions.index = homeFunctions.index + 1;
			if((homeFunctions.elms.length - 1) < homeFunctions.index){
				homeFunctions.index = 0;
			}
			homeFunctions.elms[homeFunctions.index].addClass('show_arrow');
		}
	}
}