.shadetabs{
padding: 3px 0;
margin-left: 5;
margin-top: 1px;
margin-bottom: 0;
font: bold 14px Verdana;
list-style-type: none;
text-align: center; /*set to left, center, or right to align the menu as desired*/
}

.shadetabs li{
display: inline;
margin: 0;
}

.shadetabs li a{
text-decoration: none;
padding: 2px 3px;
margin-right: 5px;
border: 0px solid #778;
color: #2d2b2b;
background-image: url(boton1.jpg); top left no-repeat;
width:145px;
height:20px;
text-align:center;
}

.shadetabs li a:visited{
color: #2d2b2b;
}

.shadetabs li a:hover{
text-decoration: underline;
color: #2d2b2b;
}

.shadetabs li.selected{
position: relative;
top: 0px;
}

.shadetabs li.selected a{ /*selected main tab style */
background-image: url(boton2.jpg);
height:20px;
border-bottom-color: red;
}

.shadetabs li.selected a:hover{ /*selected main tab style */
text-decoration: none;
}

.contentstyle{
border: 0px solid gray;
width: 100%;
margin-bottom: 1em; padding: 2px;
}