var t = 10;
var id = 1;
var n = 1
function func_focus()
{
  if(navigator.appName=="Microsoft Internet Explorer"){
	  if(n++ <= 10){
		focus_count = document.getElementById("focus").childNodes.length;
		if(id > 1) l_id = id - 1;
		else l_id = focus_count;
		if(id <= focus_count)
		{
			document.getElementById("focus_" + id).style.display = "block";
			document.getElementById("focus_" + l_id).style.display = "none";
			document.getElementById("focus_" + id).style.filter = "Alpha(Opacity=" + (130 - t * t) + ")";
			if(t > -10)
			{
				t -- ;
			}else{
				t = 10;
				if(id > focus_count) id = 1;
				else id ++ ;
			}
		}else{
			id = 1;
		}
	  }else if(n > 30){
		  n = -10;
	  }
  }else{
	  if(n++ <= 10){
		focus_count = document.getElementsByName("focus_img").length;
		if(id > 1) l_id = id - 1;
		else l_id = focus_count;
		if(id <= focus_count)
		{
			document.getElementById("focus_" + id).style.display = "block";
			document.getElementById("focus_" + l_id).style.display = "none";
			document.getElementById("focus_" + id).style.opacity = (130 - t * t)/100;
			if(t > -10)
			{
				t -- ;
			}else{
				t = 10;
				if(id > focus_count) id = 1;
				else id ++ ;
				}
		}else{
			id = 1;
		}
	  }else if(n > 30){
		  n = -10;
	  }
  }
}
var setfocus = setInterval("func_focus()",200);
//陈湘国