OK. I used this code to set it all up. I just can't get the php to display an error when the checkbox next to the text field is checked but the text field is empty (What was originally achieved with:

Code: Select all

if(document.theformname.textfield.value.length > 0)

and onkeyup in the text field).
I will post a thread in the php forum about this.
Thanks for all your help!