I defined function in application helper:
def display_standard_table(columns, collection = {})
content_tag :table do
concat content_tag :thea
Actually you are only missing a plus between content tags, you can find a similar question here
Rails- nested content_tag
The problem with this, is that maybe you will get a syntax error because of the way you are using the blocks, if you use a "{}" instead of "do end" statements you are going to be Ok.
Here (Change to the way the block is handled) you can find an example and a workaround in the case you use Rails 3 because apparently Rails 3 ignore the result of the collect statement when is inside of the content tag.