You need to add a span attribute to the CSS
Dependant on what tab design you are using, find the following in the code
Code:
#tabs1 a:hover {
background-position:0% -42px;
}
and change it to this
Code:
#tabs1 a:hover span {
color:#000000;
background-position:0% -42px;
}
Where #000000 (hex Code for Black) is the new color that you want, so now you should have the tabs show up as normal and when you hover the cursor over them with the above hex code the text will be
BLACK
Just change this color hex to whatever hex color you want
Enjoy