Dynamic amount of selectable checkbox items

[biggieuk]

Hi all,

 

I have a dynamic booking form, with two repeating tables to display a series of sessions and an extra category containing checkboxes. Table1 contains information about morning sessions ($query_sessionAM = "SELECT * FROM sessions WHERE ampm = 'am'", Table2 contains all afternoon sessions ($query_sessionPM = "SELECT * FROM sessions WHERE ampm = 'pm'".

 

I have dynamically assigned each checkbox a name using  "check" + 'sessionid' (e.g.  Check12).

 

My problem is that users should be able to select 1 or 2 choices from the morning sessions and 1 or 2 from the afternoon sessions. How can i make it so that a maximum of 2 sessions per table can be selected?

 

This number may also be changed in future so a dynamic session choice would be an advantage.

 

If anybody can give me guidance towards this then it would be much appreciated!

 

thanks