you should have extracted the resources of windows live messenger (via the skin page of plus preferences)
then look for the "styles" folder and then find the ones ending in 1004 and 1009
copy these into your skin directory, then find the line in those and edit them.
once you've done this you'll also need to add them into your skininfo.xml in the following way:
code:
<Resources>
<Replace>
<Windows>
<Styles>
<Style Id="1004">
<File>1004 Style.txt</File>
</Style>
<Style Id="1009">
<File>1009 Style.txt</File>
</Style>
</Styles>
</Windows>
</Replace>
</Resources>