Checkbox attributes for joomla-virtuemart

I need somebody familiar with joomla virtuemart ecommerce systems. I require: Using the Joomla 1.0.13 eCommerce edition (download from here [login to view URL];task=cat_view&gid=101&Itemid=66) We need to be able to input a string such as "checkbox[n],option 1,option 2, option 3, option 4, option 5, ..., option x;" in the atribute's textarea when creating products in virtuemart. With the previous string we will tell virtuemart to generate as many checkboxes as attributes (option 1, option 2, etc) while the customers are browsing the products and only allow then to choose the number of options we told in the string, "[n]" . Example: If we type within the prduct "Movies DVD" configuration, in the advanced attribute textarea the folowing string. "checkbox [2], Dirty dancing, I'm a legend, Mars attack, Kite runner, Beuwolf" The customer will be displayed the following form: Please pick 2 Dirty dancing [ ] I'm a legend [ ] Mars attack [ ] Kite runner [ ] Beuwolf [ ] So basically we need a module or addon for Virtuemart 1.0.13 eCommerce edition that allow the customers to tick a limited number of attributes for a particular product. And the chosen attributes will get registered into the database as usual when the customer submit the order. Please notice the message "Please pick" must be loaded from the lenguage file in virtuemart, the new variable which store the message will be called please_pick