@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

#dmLaunchButton {
   list-style-image: url("chrome://browser/skin/Go-arrow.png") !important;
   -moz-image-region: rect(3px 20px 19px 4px) !important;
}
#dmLaunchButton:not([disabled="true"]):hover {
   list-style-image: url("chrome://browser/skin/Go-arrow.png") !important;
   -moz-image-region: rect(3px 45px 19px 29px) !important;
}
#dmLaunchButton[disabled="true"] {
   list-style-image: url("chrome://browser/skin/Go-arrow.png") !important;
   -moz-image-region: rect(3px 70px 19px 54px) !important;
}
/* Uncomment to enable active state */
/*
#dmLaunchButton:not([disabled="true"]):hover:active {
   list-style-image: url("chrome://browser/skin/Go-arrow.png") !important;
   -moz-image-region: rect(3px 95px 19px 79px) !important;
}
*/