Gradient HTML

Provided that all of the ‘buttons’ in your application already use the HTML <button> tag, this is a simple matter to accomplish:
1. Modify your CSS to include the following:

button{background:#eee url(../images/button.png);}

2. Upload the gradient image that you intend to use. (in this example button.png)

3. Done.

For your convenience, the image I use is available here (Gradient Button Background Image)

NOTE: MSIE exhibits some poor caching behaviours when background images are used, look for a post on this elsewhere in my blog.