avoiding repetions in defining css classes

Hi to all, & this is my question:
say I have a css class such as:

.classA1 { color: RED; font-weight: bold; font-size: 11px }

Now I want to define other classes, that vary only in the font color, while everything else remains unchanged, for example:

.classA2 = { color: GREEN; rest same as A1 }
.classA3 = { color: BLUE; rest same as A1 }
.classA4 = { color: YELLOW; rest same as A1 }

How do I go about it, so I avoid having to repeat every time the same attributes? I know there is a way of defining a main class & then the variations (like for elements - a - a:hover - a:visited etc..) but I'm not sure how you do this...

Thanks a lot for your help,

Luca

.classA1, .classA2, .classA3, .classA4 { font-weight: bold; font-size: 11px }
.classA1 { color: RED;}
.classA2 { color: GREEN;}
.classA3 { color: BLUE; }
.classA4 { color: YELLOW;}

like this, with using the comma , to seperate the classes.


for the other

.main a:link {
font-weight:bold;
}

will affect all links within the element with the class .main

http://www.w3.org/TR/CSS21/selector.html