a:link {
color: #000000;
text-decoration: none;
display: block;
width: 130px;
height: 23px;
background: #999999 url(http://www.ps-systems.at/hppics/design/button/button.jpg) no-repeat;
}
a:visited {
color: #0000ff;
text-decoration: none;
display: block;
width: 130px;
height: 23px;
background: #999999 url(http://www.ps-systems.at/hppics/design/button/button.jpg) no-repeat;
}
a:hover {
color: #ff0000;
text-decoration: none;
display: block;
width: 130px;
height: 23px;
background: #999999 url(http://www.ps-systems.at/hppics/design/button/buttongr.jpg) no-repeat;
}
a:aktive {
color: #00ff00;
text-decoration: none;
display: block;
width: 130px;
hight: 23px;
background: #999999 url(http://www.ps-systems.at/hppics/design/button/buttonr.jpg) no-repeat; 
}