The button text does not display over the button graphic with higher screen resolutions (the text is centre-aligned, the button graphic is left aligned). Solution: center the graphic background as well. Two changes to the .css file follow:
.menuStandard {
background-image: url(menuButton.gif); /* original */
background: url(menuButton.gif) center no-repeat; /* replacement */
width: 109px;
height: 21px;
background-repeat: no-repeat;
text-align: center;
}
.menuSelected {
background-image: url(menuButton.gif); /* original */
background: url(menuButton.gif) center no-repeat; /* replacement */
width: 109px;
height: 21px;
background-repeat: no-repeat;
text-align: center;
}