.top { border-top: 1 solid #aaaaaa; }
.bottom {border-bottom:1 solid #aaaaaa;}
.right {border-right:1 solid #aaaaaa;}
.left {border-left:1 solid #aaaaaa;}

.top_bottom { border-top: 1 solid #aaaaaa; border-bottom:1 solid #aaaaaa;}

.left_bottom {border-left:1 solid #aaaaaa; border-bottom:1 solid #aaaaaa;}
.left_top {border-left:1 solid #aaaaaa; border-top:1 solid #aaaaaa;}

.right_bottom {border-right:1 solid #aaaaaa; border-bottom:1 solid #aaaaaa;}
.right_top {border-right:1 solid #aaaaaa; border-top:1 solid #aaaaaa;}

.right_left {border-right:1 solid #aaaaaa; border-left:1 solid #aaaaaa;}

.top_right_left {border-top:1 solid #aaaaaa; border-left:1 solid #aaaaaa; border-right:1 solid #aaaaaa;}

.todo {border-top:1 solid #aaaaaa; border-bottom:1 solid #aaaaaa; border-left:1 solid #aaaaaa; border-right:1 solid #aaaaaa;}

.espaco {font-size: 1px}
.titulos {font-family: Arial, Helvetica, sans-serif; font-size: 14px; font-weight: bold;}
.sub_titulos {font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-weight: bold;}
.categoria {font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-weight: bold; color:#0066FF;}
.links {font-family:Arial, Helvetica, sans-serif; font-size:12px; color:#000000; text-decoration:none;}
.links_tuto {font-family:Arial, Helvetica, sans-serif; font-size:14px; color:#0000ff; text-decoration:none;}a:hover{text-decoration:underline;}