No. You would need to modify your .bst file, whichever one you are using, to do this. This is not for the faint of heart. But look at the btxhak.dvi BibTeX documentation if you really want to do it.
For the faint of heart, custom-bib is an application that allows one to change some things about natbib bst files. http://wiki.lyx.org/LyX/HumanitiesLyX#bibliographies http://wiki.lyx.org/BibTeX/Background Alternatively, look for a .bst file that already has the properties you want. There are a few files linked from the wiki pages. Maria
