select random if multiple rows are the same?

Hi,
i have a select statement which returns a column value.
id like to display the lowest column value there is, but if there are multiple rows with the same (and lowest) value id like it to be random which one of the rows is selected.. how would i do this? my select statement is currently:
SELECT     TOP (1) url, ABS(r1 - @r1) + ABS(r2 - @r2)  AS difference
FROM         type
ORDER BY difference
this picks the one lowest result for me, but if there are multiple duplicate lowest results id like to select them, and show one at random..?

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