a {
        color: blue;
        text-decoration: none;
}
 
a:hover {
        color: yellow;
        text-decoration: underline;
}
 
a:hover img {border: 1px solid yellow }
a img {border: 1px solid blue }

.xstooltip 
{
    background-color: white;
    visibility: hidden; 
    position: absolute; 
    top: 0;  
    left: 0; 
    z-index: 2; 

    font: normal 8pt sans-serif; 
    padding: 0px; 
    border: solid 1px;
}

img.hidden {
  visibility: hidden;
  position: absolute;
}
img.nothidden {
  visibility: visible;
  position: absolute;
  display: inline;
}