1 First you should already have Tortoise installed.
2 Download the plugin here:http://www.tabaquismo.freehosting.net/ignacio/eclipse/tortoise-svn/subversion.html
3 Unzip the plugin to the plugins directory in your Eclipse as u usually do.
4 Now open the Preference page of your Eclipse and you can see Tortoise if everything goes well.
5 click Tortoise and you have three fields to configure,the following is what I configured :
Path:C:\Program Files\TortoiseSVN\bin\TortoiseProc.exe
SVN Server:128.64.181.66
Shared Root Folder:/CARTCCP/CARTCCP/proj_/,your project's parent dir.

Now you can File--Import--Existing Eclipse projects into Workspace,choose your project and import.

Till now you can right-click on any files in your project and you can see shortcut menu Tortoise and here you can do update、commit and so on.