ul.ptabbernav li.ptabberactive
{
 background: url("../imagenesCss/lefttab_on.gif") no-repeat left bottom   #fff;
 border-bottom: 1px solid #fff;
 text-transform:uppercase;
 padding-left:10px;

 
}
ul.ptabbernav li.ptabberactive a
{
 background: url("../imagenesCss/righttab_on.gif") no-repeat right top;
 border-bottom: 1px solid #fff;
 text-transform:uppercase;
 color:#333333; line-height:22px;
 
}