Now how can I include this following javascript code in that script. I need to know the syntax Thanks in advance.

Template, here docs, or double quoted string, see Re: Quote and Quote-like Operators / Quote and Quote-like Operators

perl -MData::Dump -MFile::Slurp -e " dd scalar read_file shift, { qw/ binmode :raw / }; " input.txt > input_txt_as_perl.pl

Also, see How do I compose an effective node title? as "CGI PERL Help required" is four stop words , things we know simply because you asked a perlquestion (perl help required) or are tangential to the problem (cgi)

You had already written Now how can I include this following javascript code in that script. I need to know the syntax Thanks in advance. and that is a pretty effective title: Syntax to include javascript

Syntax to include javascript -> Howto Include JavaScript to CGI.pm Script

The question discusses using interpolating heredocs (double quotes)