[ARW VISIONS]

I think you syntax is incorrect.

should be

A.tab:link {
COLOR: #ffffff;
TEXT-DECORATION: NONE;
}
A.tab:visited {
COLOR: #ffffff;
TEXT-DECORATION: NONE;
}
A.tab:hover {
COLOR: #ffffff;
TEXT-DECORATION: NONE;
}
A.tab:active {
COLOR: #ffffff;
TEXT-DECORATION: NONE;
}