/****************************************************************
    Copyright©John yanghua.001@hotmail.com
    create:2008-06-18 21:29
    
*****************************************************************/

var Cookie = {    
    GetCookie : function ( name ){
        var start = document.cookie.indexOf( name + "=" );
        var len = start + name.length + 1;
        if ( ( !start ) &&( name != document.cookie.substring( 0, name.length ) ) ){
            return null;
        }
        if ( start == -1 ) return null;
        var end = document.cookie.indexOf( ";", len );
        if ( end == -1 ) end = document.cookie.length;
        return unescape( document.cookie.substring( len, end ) );
    },
    DeleteCookie :   function ( name ){
        var exp = new Date();
        exp.setTime(exp.getTime()-1);
        //将exp设为已过期的时间
        var cval = Cookie.GetCookie(name);
        document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
    },
    SetCookie    :   function ( name, value, expires, path, domain, secure ){   
        domain = domain || document.domain;
        var today = new Date();
        today.setTime( today.getTime() );
        /*
        if the expires variable is set, make the correct 
        expires time, the current script below will set 
        it for x number of days, to make it for hours, 
        delete * 24, for minutes, delete * 60 * 24
        */
        if ( expires ) {
            expires = expires * 1000 * 60 * 60 * 24;
        }
        var expires_date = new Date( today.getTime() + (expires) );
        document.cookie = name + "=" +escape( value ) +
        ( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + 
        ( ( path ) ? ";path=" + path : "" ) + 
        ( ( domain ) ? ";domain=" + domain : "" ) +
        ( ( secure ) ? ";secure" : "" );	
    },
    SetPermCookie :  function ( name, value ){
        var now = new Date();
        var expval = new Date();
        expval.setTime(now.getTime() + (999*24*3600000));
        Cookie.SetCookie( name, value, expval );
    }
}