Conditionally Load Javascript

<?php
$includeScripts = array(
    "jquery/jquery",
    "jquery/jquery.easing.1.3",
    "jquery/jquery.easing.compatibility",
);

$layoutScript = sprintf('%sviews/layouts/%s.js', JS, $this->layout);
if (file_exists($layoutScript)) {
    $includeScripts[] = substr($layoutScript, strlen(JS));
}

$action = (isset($viewElement))
    ? $viewElement
    : $this->params['action'];

$controllerScript = sprintf('%sviews/%s/default.js', JS, $this->params['controller']);
if (file_exists($controllerScript)) {
    $includeScripts[] = substr($controllerScript, strlen(JS));
}


$viewScript = sprintf('%sviews/%s/%s.js', JS, $this->params['controller'], $action);
if (file_exists($viewScript)) {
    $includeScripts[] = substr($viewScript, strlen(JS));
}

if ($this->params['pass'] && preg_match('/^\w+$/', $this->params['pass'][0])) {
    $viewScript = sprintf('%sviews/%s/%s.js', JS, $this->params['controller'], $action . '_' . $this->params['pass'][0]);
    if (file_exists($viewScript)) {
        $includeScripts[] = substr($viewScript, strlen(JS));
    }
}

foreach ($includeScripts as $script) {
    echo $html->script($script);
}
?>