first create a new project named spark at the same time select the project exists locate the spark source root,then next you will see the structure ,the default has a little problem ,you must figure it out.
you must link src/java ,src/resources,src/plugin,src/xtra/,src/commercial as the source file,the finish.ok
the rest thing do according document named Spark SVN + Eclipse 3.3 + Subversive Installation Guide.
if this has something wrong please contact me or reply to me,thank you !