i need to call a javascript only if screen resolution is greater than 500.

I found below code...

    <script type='text/javascript' src='<?php echo $urlPlugin?>js/jquery.themepunch.revolution.min.js?rev=<?php echo RevSliderGlobals::SLIDER_REVISION; ?>'></script>

So, i modified it as below...

    <script>
    if (window.innerWidth > 500) {
        var head = document.getElementsByTagName('head')[0];

        var s1 = document.createElement("script");
        s1.type = "text/javascript";
        s1.src = "http://domain.com/wp-content/plugins/revslider/public/assets/js/jquery.themepunch.revolution.min.js";
        head.appendChild(s1);
    }
    </script>

However that did not work.

Later i came to know about enqueue function. i have lines as following...

    wp_enqueue_script('revmin', RS_PLUGIN_URL .'public/assets/js/jquery.themepunch.revolution.min.js', 'tp-tools', $slver, $ft);

this function auto-calls scripts. so, how do i make it conditional??