if (document.images){
t_open=new Image
t_close=new Image

t_close.src="/images/mine/dd2.gif";
t_open.src="/images/mine/dd3.gif";
}

function showdiv(num){
  if (document.all("leftsub"+num).style.display=="none" ){
                          MM_findObj("leftsub"+num).style.display=""
						  		
						  MM_findObj("imgdiv"+num).src=t_open.src
						  }else{
                          MM_findObj("leftsub"+num).style.display="none"
						  		
						  MM_findObj("imgdiv"+num).src=t_close.src
						  }
  }