jQuery.strex_urlparam = function( str, key )
    {
        var pairs = str.split( /[?&]/ );
        for( var i = 0; i < pairs.length; i++ )
        {
            var pos = pairs[i].indexOf( '=' );
            if( pos >= 0 )
            {
                var argname = pairs[i].substring( 0, pos );
                var argvalue = pairs[i].substring( pos + 1 ).replace( /(%20)|([+])/, " " );
                if( argname == key )
                {
                    return argvalue;
                }
            }
        }
        return undefined;
    }

    jQuery.strex_instr = function( str, sub )
    {
        if( str === undefined || sub === undefined ) return false;
        return (str.indexOf(sub)>=0);
    }