jsステータスバー逐字表示文字

 var i=0;
 var iIntervalID=0;
 var info="";
 var arr=[" "," "," "," "," "," "," ","!"];
 function  interval(){
        if(i<arr.length)
		{
		 info=info+arr[i];
		 window.status=info;
		 i++;
        }else
        {
		  i=0;
		  info="";
		}		
  }
function showInfo()
{
    iIntervalID = window.setInterval("interval()",2000);
}
function cancelInfo(){
   window.clearInterval(iIntervalID);
}