when a textbox has focus, you will see the text cursor in it.
if you need to validate an email address or a phone number, you have to it by yourself...
I could add an email check to my textbox plugin, but the phone number is different from country to country...
EDIT: I was wrong, there is a way to determine if a phone number is correct <img src="smileys/smiley17.gif" border="0" align="middle">
Anyway, I've added the "Validate" condition to my textbox plugin and it will check if the data you have into the textbox is valid (based on the type you choose from the editor).