svn copy: how can i copy entire folder(url) with files to another folder(url)

Hi,  I need to copy the entire directory to another Url. (svn copy  http://10.0.3.2:8080/svn/New/trunk/Test http://10.0.3.2:8080/svn/New/trunk/Test7)  its working properly(Entire Test directory copied to Test7 successfully at first time).  If i modify some of the files in 'Test' directory and again copy 'Test' to 'Test7' directory. It will copy the 'Test' directory under the 'Test7' directory like 'Test7/Test'. If i again try to copy the 'Test' Directory to 'Test7' dirctory, it shows "svn: E160020: Path 'Test' already exists" Error.  But i want to commit the modified files only to the 'Test7' directory when i copy at second time. How can i do this ?   Thanks in Advance.