File separator in Web applications

I learned that to make a web application run in both windows and unix environments file seperator needs to be taken from a system property called file.separator.
But when i develop webapplications in windows with hardcoded file separator it still works in UNIX
e.g <img src="/images/spacer.gif"> and even when i forward to jsp's
it still works
RequestDispatcher rd = request.getRequestDispatcher("/jsp/blah.jsp")
Can someone explain me how we got around that
Thanks in advance

But when i develop webapplications in windows with hardcoded file separator
it still works in UNIXThat's just fine? What's the requirement then? That it should not work in UNIX? And what exactly should not work? Web paths or absolute filesystem paths?

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