//专门用于用户登陆的js
function getCookieVal (offset) { 
	var endstr = document.cookie.indexOf (";", offset); 
	if (endstr == -1) 
	endstr = document.cookie.length; 
	return unescape(document.cookie.substring(offset, endstr)); 
} 

function GetCookie (name) { 
	var arg = name + "="; 
	var alen = arg.length; 
	var clen = document.cookie.length; 
	var i = 0; 
	while (i < clen) { 
		var j = i + alen; 
		if (document.cookie.substring(i, j) == arg) 
			return getCookieVal (j); 
		i = document.cookie.indexOf(" ", i) + 1; 
		if (i == 0) break; 
	} 
	return null; 
}
function GetSubCookieValue( CookieString,SubName )
{
         var CkNameValue = "";
         //alert(CookieString);
         var cookieStr = CookieString.split("&");
         for( i=0 ; i< cookieStr.length ;i++)
          {   
              if( cookieStr[i].indexOf( SubName ) >=0 )
              {  
                var cookieUse = cookieStr[i].split("=");
                CkNameValue  =  cookieUse[1] ;
              }  
           }
         return CkNameValue;
}