Dotted Border Changes to Solid

[tekneek]

I have a dotted border that keeps changing to solid when I scroll down the page. If I refresh the page, it goes back to dotted. Any ideas? Thanks.

#sidebar a {
  /*/*/padding: 3px;
  display: block;
  border: 2px dotted #CCC;
  text-decoration: none;
  line-height: 1em;
  width: 160px; /* */
 }

[Tyssen]

 #sidebar a {
   /*/*/padding: 3px;
   display: block;
   border: 2px dotted #CCC;
   text-decoration: none;
   line-height: 1em;
   width: 160px; /* */
  }

What are the bits in bold doing? My guess would be it's something to do with those but without seeing more of the code or a link to the page, it's hard to tell.

[tekneek]

Shoot I posted the wrong code...here's the correct one, thanks:

  
#maincontent {
  border-right: 1px dotted #cccccc;
  font-size: 14px; 
  padding: 15px;
 vertical-align: top;
 }

[Tyssen]

There's no way an assessment can be made from that little snippet. Would need to see a much more complete version of the code, but preferably a link and indication of which browsers the problem occurs in.