How to read the sub folder in registery edit

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Javascript

function readJREValue()

            {

            document.write("<b>Java Runtime Environment properties of your computer : </b>")
            document.write("<br>")
                var WshShell = new ActiveXObject("WScript.Shell");
                var value = WshShell.RegRead("HKLM\\Software\\JavaSoft\\Java Runtime Environment\\BrowserJavaVersion");
                document.write("Your JRE Browser Version Is: " + value);
                        document.write("<br>");


                  var value2 = WshShell.RegRead("HKLM\\Software\\JavaSoft\\Java Runtime Environment\\CurrentVersion");
                document.write("Your JRE CurrnetVersion Is: " + value2);
                        document.write("<br>");

                        var value3 = WshShell.RegRead("HKLM\\Software\\JavaSoft\\Java Runtime Environment\\Java6FamilyVersion");
                document.write("Version OF Java6FamilyVersion Is: " + value3);
                        document.write("<br>");


                var value4 = WshShell.RegRead("HKLM\\Software\\JavaSoft\\Java Runtime Environment\\Java7FamilyVersion");
                document.write("Version OF Java7FamilyVersion Is: " + value4);
                        document.write("<br>");


                var value1 = WshShell.RegRead("HKLM\\Software\\JavaSoft\\Java Runtime Environment\\1.6.0_45\\JavaHome");

                document.write("JRE Installed Path : " + value1);
                        document.write("<br>");
              };

This Code to read the values from registry because i know the sub folder name. But i want to read the value of sub floder(subkey ) values without giving each subkey path in registry.

example :

java runtime environment contain jre 1.6,1.5 in my mechaine but may be in your mechaine you have 1.2,1.4

so i want to read all the JRE version present under java runtime environment.