Ok so i managed to do this without CGI. It's a bit ugly but it works. in my HTML file(technically my .tt2 file) i have this in my javascript area:

for(m=0;m<selected.length;m++){
                document.form.values.value += selected[m].name+',';
                }
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then I have this in my actual html area:

<form method="post" name="form"  action=" [% Catalyst.uri_for('/agg/su
+bmit')  %] ">

<INPUT TYPE="hidden" NAME="values">
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and then in my catalyst controller ( which is agg.pm with submit as the method) :

my $selected    = $c->request->params->{values};
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from here i can parse the string into an array and proceed with my program.