The @_jscript_version variable hold the JScript version number in major.minor format.
Before accessing the @_jscript_version variable, use the @cc_on statement to define the variable.
<html>
<script language="JScript">
<!--
//Set conditional compilation so @_jscript_version variable will be defined.
@cc_on
//Display the JScript verision number using the @_jscript_version variable
document.write("The JScript version is ",@_jscript_version);
-->
</script>
</html>