一单个 <a>不变色 

<a href="#" style="color: #FF0000">测试测试</a>

全站<a>不变色

a:link { 
font-size: 12px; 
color: #FF0000; 
text-decoration: none; 
} 
a:visited { 
font-size: 12px; 
color: #FF0000; 
text-decoration: none; 
} 
a:hover { 
font-size: 12px; 
color: #999999; 
text-decoration: underline; 
}