color, background color

hello

very quiet here...

could someone explain these validation results from
the W3C CSS Validation Service to me?  i mean since
when do i have to specify a background color for
links?

Warnings :
Line : 12 Level : 1 You have no background-color with
your color : A:link 
Line : 14 Level : 1 Redefinition of color : A 
Line : 80 Level : 1 You have no color with your
background-color : .beigeheader 
Line : 95 Level : 1 You have no background-color with
your color : HR 

and here's what it refers to:

11  A.nav  {text-decoration : none;}
12  A:link  {color : #0066CC;}
13  A:vlink {color : #993300;}
14  A:alink, A:hover {color : #993300; background :
#FFFF00;}

79  .beigeheader {
80  	background : #FFFFCC;
81  	font-weight : bold;
82	border-top-width : thin;
83	border-bottom-width : thin;
84	}

94  hr {
95	color : #990000;
96	margin-left : 8%;
97	margin-right : 8%;
98	}

thank you very much for your help
iris


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