//显示
function show_box(o,obj){
  var m=document.getElementById(obj);
  m.style.pixelLeft=getL(o);
  m.style.pixelTop=getT(o)+o.offsetHeight;
  m.style.visibility='';
}

//隐藏
function hide_box(obj){
  document.getElementById(obj).style.visibility='hidden';
}   

//取得左边的位移
function getL(e){
  var l=e.offsetLeft;
  while(e=e.offsetParent){
    l+=e.offsetLeft;
  }
  return l;
}

//取得顶部的位移
function getT(e){
  var t=e.offsetTop;
  while(e=e.offsetParent){
    t+=e.offsetTop;
  }
  return t;
}

var desc;
var _type;
var rec_id;
var num;

//确认删除操作
function confirm_clear(_type)
{
	if(_type == 'clear')
	{
		desc = sure_clear;
	}
	else
	{
		desc = sure_del;
	}
	
	if(confirm(desc))
	  return true;
	else
		return false;
}

//ajax改变商品数量
function change_num(rec_id,num)
{
	Ajax.call('cart.php?is_ajax=1&act=ajax_update_amount', 'rec_id=' + rec_id + "&goods_num=" + num, update_amount, "GET", "JSON");
}

//ajax更新金额
function update_amount(result, text_result)
{
	document.getElementById('cart_amount').innerHTML = result.content;
}

//login
	function onclick_account()
	{
		if( document.getElementById("login_account").value == account_desc )
		{
			document.getElementById("login_account").value = "";
		}
	}
	function onblur_account()
	{
		if(document.getElementById("login_account").value == "")
		{
			document.getElementById("login_account").value = account_desc;
		}
	}