Yup, I am right... check out this example of how it worked in 2002.
Note: From January 3 to January 20, 2001, with the Senate divided evenly between the two parties, the Democrats held the majority due to the deciding vote of outgoing Democratic Vice President Al Gore. Senator Thomas A. Daschle served as majority leader at that time. Beginning on January 20, 2001, Republican Vice President Richard Cheney held the deciding vote, giving the majority to the Republicans. Senator Trent Lott resumed his position as majority leader on that date. On May 24, 2001, Senator James Jeffords of Vermont announced his switch from Republican to Independent status, effective June 6, 2001. Jeffords announced that he would caucus with the Democrats, giving the Democrats a one-seat advantage, changing control of the Senate from the Republicans back to the Democrats. Senator Thomas A. Daschle again became majority leader on June 6, 2001. Senator Paul D. Wellstone (D-MN) died on October 25, 2002, and Independent Dean Barkley was appointed to fill the vacancy. The November 5, 2002 election brought to office elected Senator James Talent (R-MO), replacing appointed Senator Jean Carnahan (D-MO), shifting balance once again to the Republicans -- but no reorganization was completed at that time since the Senate was out of session.
http://tinyurl.com/yqqzw
It depends on who the members "CAUCUS" with. Both Independents have said they will caucus with the Democrats, so if they do... the Democrats only need 49 seats to gain control of the Sennate. The 49 plus the 2 independent votes would give them 51 votes and control!