HELP! Extra variables for comments

[scud]

I have created two extra variables for some of the categories. They are $arrivalDate and $departDate. They are entered in the product_info page by the customer. What I would like is to quote them in the comments area when the customer is checking out. Thus they will be mailed to the webmaster as comments and they will also be included in the DB. For example, the default value of the comments area should be:

"Check-in date: " . $arrivalDate . " - Check-out date: " . $departDate"

I am not very good with PHP so this might be wrong. I also can't figure out where exactly should I insert this code (or any other correct one) to get the result I want.

 

If you want to get an idea try this: http://athenaeum-travel.gr/product_info.ph...products_id=259