Combine c++ and javascript development in Eclipse

I am new to Eclipse IDE, but now I need it to develop apps for webOS.

Help me please with the next questions:

1. I have downloaded the Eclipse IDE for JavaScript Web development. How can I find it's version information?
2. Can I use one instance of Eclipse IDE for JavaScript and C++ development at the same time? (if yes then please write the steps to extend JavaScript IDE to support C++ development) Or I should have two instances installed?
3. Some parts of documentation are written exactly for Eclipse Galileo C++ development. Are different versions of Eclipse IDE really different? Will I have problems porting settings from Galileo 开发者_开发百科to Helios or Indigo?

Thanks.

1. Usually Versioninformation can be found under Help->About Eclipse

2. I do not know about this exact setup but I have Java/C++/PHP in one Eclipse install. I installed the java version and then Help->Install New Software where I choose -all sites- as source and then searched for the compontent I wanted and installed it. After installation restart eclipse to load the new plugins and now you should have a new Perspective for the language you installed. If you can not find the perspective look under Window->Open Perspective->Other.

3. I do not know although I work with different version. Maybe some names (for example in menus) are changed but I really can't say (maybe a hint that they are not different? But Probably I just did not dive that deep into it).

The menu-paths I gave are under Indigo release.

I'm using Eclipse CDT with Aptana as a plugin which covers both bases for me.