In this example, i will tell you How you can change link color and appearence When the mouse is placed over the link.In the below example when someone placed mouse over the link the text color will change and the underline disappears.
You can do this by just Place the <STYLE> tag between your <HEAD> and </HEAD> tags.
<STYLE>
<!--
A:active { color:#0000FF; text-decoration; }
A:hover { color:#FF0000; text-decoration: none; }
//-->
</STYLE>
You can change the color code according to your need.