Links added with one of the functions ps_add_weblink(),
ps_add_pdflink(), etc. will be displayed with a
surounded rectangle when the postscript document is converted to
pdf and viewed in a pdf viewer. This rectangle is not visible in
the postscript document.
This function sets the length of the black and white portion of a
dashed border line.
Parameters
psdoc
Resource identifier of the postscript file
as returned by ps_new().