Preventing blank fields in custom html form submission

[jzadra]

I'm using an html form to collect time of day information in 3 fields (hours, minutes, am/pm). I've had some problems with subjects leaving one or more fields blank, so I want to make sure they are all filled in before the info can be submitted.

I've added a javascript to the html page which checks the form for blanks before submission is allowed. It works when the page is opened in a standard browser, but within medialab, its as if the script isn't there... ie it allows blanks without any argument.

Can anyone suggest A) how to make my script work OR B) a better way to check for blank html fields OR C) a better way to collect time of day info in medialab.

I've attached the .que, the html file, and the JS script.

Thanks,

Jon