Here's what I use for a button. You can play around with every setting to change the look (more rounded, less rounded, different color background/font/border, etc). If I remember correctly I got this from Kirk Trachy's Magic Buttons.
var text URL = "
http://maps.google.com/maps?f=q&hl=en&q="
&URLEncode(
[Account - Venue Address]);
var text Words = ToText(
[Account - Venue Address]);
"<a style=\"text-decoration:none; background: #305988; border-radius: 5px; color: #ffffff; display: inline-block; padding: 4px 0px 0px 0px; width:194px; height:22px; text-align: center; text-shadow: none; border: 1px solid #030404; font-size: 12px \"href='"
& $URL
& "'>" & $Words & "</a>"
Notes:
-The padding is top,right, bottom, left. Or you can remove two of them and it becomes top/bottom, right/left
-If you remove the height or width it will auto determine it based on the font size etc.
-Make border radious 1000px for a fully rounded button
-I've never played with 'text-decoration' so I don't actually know what that is lol. But I suspect a quick google will solve that.
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Mike Tamoush
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