Check All Textfields

I'm building a multi-language PHP/mySQL -site. I'm also building a CMS for the site.

There are 5 languages. In the CMS fields for e.g. english
bodytext are called (id=) 'bodytext_en'.
German looks like 'bodytext_ge', etc.

The '_en' part tells us that it's a textfield for english texts.
How can i check if ALL english fields are filled out, without
defining each and every field separately.
Like:

if(document.(allfields.'_en').value == ''){
alert('Hey!')
};