Stylesheets are the way to go.. learn um.
For your purposes though, you could do something like, in a separate file:
A {text-decoration: none;}
A.StandardNoUnderline
{
FONT: 12px verdana,arial,helvetica;
FONT-WEIGHT: bold;
COLOR: #FFFFFF;
}
A.StandardUnderline
{
FONT: 12px verdana,arial,helvetica;
FONT-WEIGHT: bold;
TEXT-DECORATION: Underline;
COLOR: #FFFFFF;
}
Naturally, you can change the values specified above.
Save the above to a separate file called "style.css" Upload it to the root dir where all your other html files are.
Place this in the file you want to have some underlined links, and some not:
<LINK REL="stylesheet" TYPE="text/css" HREF="style.css">
Now when making the HREF's, specifiy the class:
<A CLASS=StandardNoUnderline Href=whatever.html>No underline</A>
<A CLASS=StandardUnderline Href=whatever.html>Underline</A>
There is much more to CSS than this, and I suggest going over a tutorial or 2.