Hi, I need some help. I'm busy with a boardroom booking system. On the one page I'm displaying a start time and an end time. Both have dropdown boxes for HH and MM. The End time's dropdowns are disabled. These drop downs display hours from 06am to 8pm and minutes 00, 15, 30, 45. The problem is that because the end time dropdowns are disabled the user doesn't select an end time. The user enters a meeting duration in the next field ie. 1 hour 20 min. When entering this, the end time (drop downs) should automatically calculate and display an end time in the drop downs and round of to the nearest 15. Can anyone help??