function countnum(id,i){
			var xmlhttp;
			var tt=document.getElementById("c_"+i);
			try{
			 xmlhttp=new XMLHttpRequest();}
			catch(e){
			 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}
			xmlhttp.onreadystatechange=function(){
			tt.innerHTML="<br><img src='http://www.bst120.com/images/loading.gif'> 加载中... ";
			if (xmlhttp.readyState==4){
			  if (xmlhttp.status==200){
			    var data=xmlhttp.responseText;
 			    tt.innerHTML=data;
			    }
			  else{
			    tt.innerHTML="<br>请求超时，点击<a href='#' target='_self' onclick='location.reload();'>刷新</a>"				 
			      }
			    }
			  }
			xmlhttp.open("post","http://www.bst120.com/hospital/countnum.asp",true);
			xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded');
			var url="id="+id;
			xmlhttp.send(url);
		}