function changarea(obj){
	    var id = obj.value;
	   	currentPos = "area2"; 
		send_request("shop_ajax.jsp?type=2&area_id="+id);
    }
    
    function list_all(obj){
        window.location.href="index.jsp?trade="+obj;
    }
    
    function change_order(obj,obj1,obj2){
       var id = obj.value;
       window.location.href="index.jsp?order="+id+"&lb="+obj1+"&trade="+obj2;
    }
    
    function  ch_area(obj){
       var id = obj.value;
       window.location.href="index.jsp?area1="+id;
    }
    
    function checkform(obj){
       var content = document.getElementById("content").value;
       var len = content.length;
       if (len>500){
          alert("回复不能超过500个字符，您现在的字符个数为"+len+"个");
          return false;
       }else if(len==0){
          alert("回复不能为空");
          return false;
       }
	   var yz = document.getElementById("yz").value;
	   if(yz==null||yz==""){
	   	   alert("输入验证码!");
		   return false;
	   }
	   return true;
    }