Save the files pst-ovl.sty|.tex| in a directory, which is part of your local TeX ovl. Then do not forget to run texhash to update this ovl if these packages are new to your TeX distribution. pst-ovl needs pstricks, which should be part of your local TeX installation, otherwise get it from a CTAN server, f.ex. http://mirror.ctan.org/graphics/pstricks/ hvoss@tug.org