$(window).resize(function() {
    if($('#TB_window')) {
        var size = tb_getPageSize();

        if($(window).height() < $('#TB_window').height())
        {
            $('#TB_window').css({top: (TB_HEIGHT / 2) + 'px'});
        }else{
            $('#TB_window').css({top: size[1]/2 + 'px'});
        }

        if($(window).width() < $('#TB_window').width())
        {
            $('#TB_window').css({left: (TB_WIDTH / 2) + 'px'});
        }else{
            $('#TB_window').css({left: size[0]/2 + 'px'});
        }
    }
});

function TB_setPosition() {
    if($('#TB_window')) {
        var size = tb_getPageSize();

        if($(window).height() < $('#TB_window').height())
        {
            $('#TB_window').css({top: (TB_HEIGHT / 2) + 'px'});
        }else{
            $('#TB_window').css({top: size[1]/2 + 'px'});
        }

        if($(window).width() < $('#TB_window').width())
        {
            $('#TB_window').css({left: (TB_WIDTH / 2) + 'px'});
        }else{
            $('#TB_window').css({left: size[0]/2 + 'px'});
        }
    }
};