.over
{
width: 84px;
height: 22px;
background-image: url("glyphicons/png/glyphicons-441-folder-closed.png");
background-repeat: no-repeat;
}
 
a.over:hover
{
width: 84px;
height: 22px;
background-image: url("glyphicons/png/glyphicons-145-folder-open.png");
background-repeat: no-repeat;