Código PHP:
a, a:link{
background:url(../images/imagen1.gif) top no-repeat;
display:block;
height:197px;
text-align:center;
font-size:16px;
padding-top:10px;
color:#FFFFFF;
}
a:hover{
background:url(../images/imagen2.gif) top no-repeat;
color:#0B8507;}