/* 判断用户是否处于登录状态
 * 通过特定Cookie变量判断是否登录（当商户进行实际操作时，要进行sesstion判断） 
 * return boll
*/
function check_login(){
	var cookie_front = read_cookie('cookie_front_ids');
	if(cookie_front=='' || cookie_front==null){
		return false;
	}
	else{
		return true;
	}
}

/*
 * 获取cookie值
*/
function read_cookie(cookieName){
  if(document.cookie.length > 0)
  { 
	//alert(document.cookie);
	var cookieString = document.cookie;
	//var cookieName='cookie_front_ids';
	start = cookieString.indexOf(cookieName+'=');
    if (start != -1)
    {
	  start += cookieName.length + 1;
	  var end = cookieString.indexOf(';',start);
	  if (end == -1){
		  //alert(cookieString.substring(start));
		  return unescape(cookieString.substring(start));
	  }
	  else{
		  return unescape(cookieString.substring(start,end));
	  }
    }
  }
  else{
  	return null;
  }
}
function expandIt(el,image_url) {
	whichEl = document.getElementById('product_div_'+el).style;
	if (whichEl.visibility == "hidden") {
		whichEl.visibility = "visible";
		whichEl.display = "block";
		document.getElementById('img_'+el).src = image_url+'/images/icon41.gif';
	}
	else{
		whichEl.visibility = "hidden";
		whichEl.display = "none";
		document.getElementById('img_'+el).src = image_url+'/images/icon31.gif';
	}
}