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use <only if="!condition">
...like...
<only if="1">
...returns true but
<only if="!1">
...returns false. Same with form fields...
<only if="FormField">You entered the form field</only>
...returns true if FormField has something in it & false if it don't...returning true means it display's what's in the
<only>...returning false means it don't...
<only if="!FormField">You didn't enter the form field</only>
...does the opposite...returns true if FormField has nothing in it & false if it does. Yes, I'm (pretty) sure this works
with html...
<only if="!FormField"><blink>You didn't enter the form field</blink></only>