Before anything… to get a good answer, you need to provide a good question. Code examples would help a lot.
You can use jQuery to accomplish what you need.
Suppose your checkboxes are in a list.
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You can assign an ID to the list UL.
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You can use jQuery to run through every element in that list and see if the checkboxes are checked
$("#checked li:checkbox").each(function(){
if($(this).is(':checked')){ //from here you can put the results found in an array, // or just append to a hidden div that you can target with the lightbox plugin you're using. } });
The idea is to build a hidden DIV that you can use to open as a lightbox. The submit button would have to trigger your form to submit the data to either a table you created in your database, or add it to an existing wordpress table. I hope this helps you get it started.