Show different image on different language Gtraslate

Question

I use this java and find Gtranslate languege cookie (googtrans)

<script type="text/javascript">
// Original JavaScript code by Chirp Internet: chirpinternet.eu
function getCookie(name)
  {
var re = new RegExp(name + "=([^;]+)");
var value = re.exec(document.cookie);
return (value != null) ? unescape(value[1]) : null;
  }
</script>

I have 2 results: "null" and "/el/en" I print the result with it

<script type="text/javascript">
document.write(getCookie("googtrans"));
</script>

I want to show a differnt image for a different languege I use, if ... else, but do not display a different image...

<p id="demo"></p>
<script>
let greeting;
if (googtrans = "/el/en") {
greeting = "<img src=.../banner_en.jpg>";
} else {
greeting = "<img src=.../banner-el.jpg>";
}
document.getElementById("demo").innerHTML = greeting;
</script>