my $cookie = 'name1,value1,name2,value2';
my %hash = split(',', $cookie);
[download]

Or you can use string eval on your quoted string (but why?):

my $cookie = '("Name1","Value1","Name2","Value2")';
my %hash = eval $cookie;
[download]

update: But don't do that. As crazyinsomniac points out, it's not a really good idea to eval cookie contents...