I beg to differ
--#--
We could beg them to "Please, don't click Submit more 
than once." This is a common tactic. And who says 
multiple submissions are that great a problem? They're 
obvious when they occur, and it's easy enough to ignore 
multiples.<br>
<br>
That's fine in a low-volume site where form data is handled 
manually on the back end. But what about automated systems where 
data in from the Web triggers a process on the back end -- like 
stock trades, balance transfers, orders to the wholesaler, etc.?<br>
<br>
Besides, begging them to stop pounding on the button just isn't 
programmatically satisfying.<br>
<br>
We could have the button simultaneously submit <i>and</i> pop up 
an "OK-that's-enough" window.<br>
<br>
<code>
<script language="JavaScript">
	<!--
	function popup(url,name,x,y) {
		window.open(url,name,\"resizable=1,width=\"+x+\",height=\"+y+\",top=40,left=400\"); 
	}
	//-->
</script>";
</code>
<br>
The HTML form would look like this. <br>
<br>
<code>
<form action="/cgi-bin/getstuff.cgi" method="post" 
	onSubmit="popup('thatsenough.html', 'Warning', 400,300)">
</code>
<br>
And you can even put a little "Close" button on the popup if you 
want.<br>
<br>
<code>
<form>
<font face="verdana,helvetica,arial" size="-1">
<input type="button" value=" Close " onClick="window.close()">
</font>
</form>
</code>
<br>
If you want to see this contraption run, go 
<a href="/gadgets/post/dostuff.html">here.</a>
<br>