All graphics are generated by CSS, no use of image files.

See http://gradients.glrzad.com/

/* For Internet Explorer 5.5 - 7 */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#aaaaaa, endColorstr=#eeeeee);

/* For Internet Explorer 8 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#aaaaaa, 
endColorstr=#eeeeee)";   

/* for non IE browsers */
background: -webkit-gradient(linear, left top, left bottom, from(#aaaaaa), to(#eeeeee));

background: -moz-linear-gradient(top,  #aaaaaa,  #eeeeee);

background: -o-linear-gradient(top,  #aaaaaa,  #eeeeee);