they just keep jumping and raising the bar or lowering it depending on if they pass the height or fail, more detailed answer found on the high jump wiki
http://en.wikipedia.org/wiki/High_jump#Declaring_the_winner
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the vice president's only job, besides becoming president if the president dies, is to break a tie in a vote in the senate.
Under the Senate's rules, a bill has to receive a majority (meaning more than half) of the votes to pass. Therefore, if there is a tie and there is no Vice President to break the tie, the bill fails because is has not received a majority. A previous answer asserted that the President Pro Tempore would break the tie--however, the President Pro Tem is a Senator and therefore would presumably have already voted.
to break a tie in the senate
The Vice President of the US votes to break the tie. In Article 1 Section 3 of the Constitution it says that the Vice President becomes the President of the Senate, but has no vote, unless there it a tie.
The President of the Senate (Vice President of the United States) is given that authority in the US Constitution.