var banner_currentShow=1;
var banner_nextShow=1;
var banner_timer;

function playImg(id) {	  
	  $("#btn_"+banner_currentShow).removeClass("onfocus");
	  $("#btn_"+banner_currentShow).addClass("onblur");
	  $("#btn_"+id).removeClass("onblur"); 
	  $("#btn_"+id).addClass("onfocus"); 
	  $("#img_"+banner_currentShow).hide();
	  $("#img_"+id).show();
	  banner_currentShow=id;
}

function autoPlayImg() {
    if(document.getElementById('btn_'+(parseInt(banner_nextShow)+1)) == null) {
		    banner_nextShow=1; 
	  }
	  else {
		    banner_nextShow++;	  
    }
    
	  banner_timer = setTimeout(function() {
		    playImg(banner_nextShow);
		    autoPlayImg();
	  },2000);
}

function callAutoPlay(id) {	 
    banner_nextShow=id;
    playImg(id);
    autoPlayImg();
}