Logged In: YES
user_id=902931

Try doing a content.getLink with a find on "login.jsp".
WebUnit can find and execute links on <a href tags, the text
between those tags or any other tag in between. You could
also use any other text in the image tag to execute the
surrounding link, like "btn_enter.gif".

Ex:

contentsContents.getLink("login.jsp",
WebTag.FIND_CONTAINS).click();

contentsContents.getLink("btn_enter.gif",
WebTag.FIND_CONTAINS).click();