//检查用户是否登录
String.prototype.trim = function()
{
	return this.replace(/(^\s*)|(\s*$)/g,"");
}
function checkUserLogin()
{
 	var cooks = document.cookie;
 	if(cooks != null && cooks.length > 0)
 	{
 		var cks = cooks.split(";");
 		for(var ii=0; ii<cks.length; ii++)
 		{
 			if(cks[ii].indexOf("usrtick") != -1)
 			{
 				var memberStr = cks[ii].substring(cks[ii].indexOf("usrtick") + 9,cks[ii].length-1);
 				var str = memberStr.replace(/\\/g,"");
 	 			var member = eval("(" + unescape(str) + ")");
 	 			return member;
 			} 	 		
 		}
 		if(ii = cks.length)
 		{
		   return null;
 		}
 	}	
 	else
 	{
 		return null;
 	}
}

//登出
function log_out()
{
	var cooks = document.cookie;
 	if(cooks != null && cooks.length > 0)
 	{
 		var cks = cooks.split(";");
 		for(var ii=0; ii<cks.length; ii++)
 		{
 			if(cks[ii].indexOf("usrtick") != -1)
 			{
 				cooks = cooks.replace(cks[ii],"");
 				break;
 			} 	 		
 		}
 		document.cookie = cooks;
 	}
}