Copy and zip your favourite MS fonts from the nearest Windows box, a good start would be Arial, and Verdana, this will improve the look of most websites considerably.
On the Solaris box unzip the fonts into a temporary directory, using the -L switch ensures that the font names are lower case.
#unzip -L arial.zip
in the same directory run
#sdtfontadm
This is a GUI tool, so just select the new fonts and click Install, the fonts will be installed in $HOME/fontadm_fonts. Earlier versions of this tool were reported to be unreliable, but the Sol9 version has worked everytime for me.