Included source of javascript via PHP, onmousemove event, function is not defined

I have i php require:

if ($infoSystem['timeout'] == 1) {require_once 'set_timeout.php';}

function in set_timeout.php which invoke error:

// Reset timers.
    function ResetTimers() {
        clearTimeout(warningTimer);
        clearTimeout(timeoutTimer);
        StartTimers();
        $("#timeout").dialog(\'close\');
    }

output error:

ResetTimers is not defined on line: xxx

Thanks for any help