The @_jscript_build variable holds the build number of the JScript scripting engine.
Before accessing the @_jscript_build variable, use the @cc_on statement to define the variable.
<html> <script language="JScript"> <!-- //Set conditional compilation so @_jscript_build variable will be defined. @cc_on document.write("The JScript engine build number is ",@_jscript_build); --> </script> </html>