body 
{
    font-family: Helvetica;
}

.tabfondo
{
    position: absolute; 
    top: 0; 
    bottom: 0; 
    left: 0; 
    right: 0; 
    width: 100%; 
    height: 100%;
}

 .izq
    {
        background-image: url("images/bgleft.gif");
        background-repeat:repeat-y;
    }
    
 .der
    {
        background-image: url("images/bgright.gif");
        background-repeat:repeat-y;
        background-position:right;
    }
    
 .cent
    {
        background-image: url("images/bgcenter.gif");
        background-repeat:repeat;
    }
    
a:link {color: Black;}
a:visited {color: Black;}
a:hover {color: Black;}
a:visited {color: Black;}