Getting absolute path of a JAR from its classfiles?

I am creating a class witch is going into a jar-file. With this jar-file I will also have another file (config/data-file). That file will allways be in the same directory as the jar-file.
What I am wondering is: How can i programatically get the path of the "current" JAR file the "current" class is contained within, so that I can open/read the config/data file?
Today I use a method which i hope I can replace with a better method:
private static String jarfile="progconf.jar";
private static String projectname="ProgramConfig";
public static String getJarPath() throws Exception{
     try{
          String jvc = System.getProperty("java.class.path")+";";
          if(jvc.indexOf("\\"+jarfile+";")>0){
               jvc = jvc.substring(0,jvc.indexOf("\\"+jarfile+";"))+"\\";
               jvc = jvc.substring(jvc.lastIndexOf(":")-1); //Filsti
          }else if(jvc.indexOf("\\"+projectname+";")>0){
               jvc = jvc.substring(0,jvc.indexOf("\\"+projectname+";"))+"\\";
               jvc = jvc.substring(jvc.lastIndexOf(":")-1); //Filsti
          }else{
               throw new Exception("Klarte ikke finne JarPath!");
          return jvc;
     }catch(Exception ex){
          throw new Exception("getJarPath-" + ex.getMessage());
}-Wolflad

check out my replies at the link shown below:
http://forum.java.sun.com/thread.jsp?forum=57&thread=494736
;o)
V.V.

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