Enqueue script if screen is greater than 500

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??

instead of enqueueing script i used register_script so that the script can be called later.

Which is working. Then placed javascript code in header.php

However unable to call script if screen is greater than 500.

Also tried this…

 <script>
 if( $(window).width() > 500 )
 {
 $.ajax({
 url: 'http://domain.com/wp-content/plugins/revslider/public/assets/js/jquery.themepunch.revolution.min.js',
 dataType: "script",
 success: function() {
    //success
 }
 });
}
</script>