// Function to allow one JavaScript file to be included by another.
function IncludeJavaScript(jsFile) {
  document.write('<script type="text/javascript" src="' + jsFile + '"></scr' + 'ipt>'); 
}

if (document.location.protocol != "https:") {
  IncludeJavaScript('http://www.co2stats.com/propres.php?s=1256')
} else { 
  IncludeJavaScript('https://www.co2stats.com/propres.php?s=1256')
};