Automatic onsubmit?

[Andy]

<form onsubmit="call_rss();return false;">
<input type="text" name="rssurl" id="rssurl" size="40"
value='Skype'>
</form>

The code above has the value "Skype" and only after hitting Enter/
Return key, the value is submitted. How can the value "Skype" be
submitted automatically without pressing Enter/Return key?

Thanks for the tips, gurus