There are two simple ways to disable enter key in your forms.
1. The first one is a piece of javascript that you include in your head section.
<script language="JavaScript">
function disableEnterKey(e)
{
var key;
if(window.event)
key = window.event.keyCode; //IE
else
key = e.which; //firefox
if(key == 13)
return false;
else
return true;
}
2. Than in the form issue onKeyPress like this:
<input type="text" onkeypress="return disableEnterKey(event)">
The easiest way of disabling the enter key may be this one:
<input type="text" onkeypress="return event.keyCode!=13" />