Helper help

I need a helper, which will render a table in my customized style.
I wrote a code like this:

template.rhtml:
<% @column_names = [“Name”, “Age”, “Sex”] %>
<%= table_show @column_name %>

helper.rb
def table_show(names)
for name in names
content_tag ( :div, name, :class => ‘table_header’ )
end
end

Which should give me an output like this:

Name
Age
Sex

Unfortunately I have only one line of output which looks like:
NameAgeSex

After few trials it seems, that this output is being generated by line:
“for name in names”, because deleting “content_tag…” doesn’t make any
differences.

What am I doing wrong?
I suppose that helper def does treat an Array like a String…

Regards,
Tomasz Tomczyk