Basically, I have a form with a lookup field. If the user selects an item from that lookup field that has a "*" or if the user selects an item that is not "online" I want Zoho to display a message box saying "You have selected an item that is not currently available, please go back and select one that is 'Online'".

Is there anyway to do this?

I was able to do something along these lines via Visual Basic using MessageBox codes, but I am not sure how to do this with Zoho Creator. I do not see any Message Box functions or codes in the deluge scripting under the forms. 

Any help is greatly appreciated!