Hi!
Speaking of Mibew 1.6.x, if you take a look at the HTML code of a chat button, you'll see something like this:
<!-- mibew button --><a href="/client.php?locale=en" target="_blank" onclick="if(navigator.userAgent.toLowerCase().indexOf('opera') != -1 && window.event.preventDefault) window.event.preventDefault();this.newWindow = window.open('/client.php?locale=en&url='+escape(document.location.href)+'&referrer='+escape(document.referrer), 'mibew', 'toolbar=0,scrollbars=0,location=0,status=1,menubar=0,width=640,height=480,resizable=1');this.newWindow.focus();this.newWindow.opener=window;return false;"><img src="/b.php?i=mibew&amp;lang=en" border="0" width="163" height="61" alt=""/></a><!-- / mibew button -->
So, basically, you just need to manually change the values of width and height (I've marked them for you in the code above).
Alternatively, you can change the function
generate_button in the
libs/getcode.php file. Though, in this case you'll have to support this change for all upcoming Mibew 1.6.x releases.