You can not do it, since it is a security switch that only the user can turn.
But you can make your user notice he MUST have scripts on if he want to have full experience at your website.
just declare a
noscript tag:
<script>
document.write("Hello World!")
</script>
<noscript>Your browser does not support JavaScript!</noscript>
for more information, access this url:
http://www.w3schools.com/tags/tag_noscript.asp[
^]
hope it helps :)