a.mainNav:link    {
                    /* Applies to unvisited links of class mainNav */
                    text-decoration:  none;
                } 
a.mainNav:visited {
    /* Applies to visited links of class mainNav */
    text-decoration:  none;
} 
a.mainNav:hover   {
    /* Applies to links under the pointer of class mainNav */
    text-decoration:  none;
} 
a.mainNav:active  {
    /* Applies to activated links of class mainNav */
    text-decoration:  underline;
}