http://esther.mathematik.uni-osnabrueck.de/tex/tex/online-help/ltx-109.html (Einblicke ins Internet, 10/1995)\nopagebreak[number]
The \nopagebreak command prevents LaTeX form breaking the current page at the point of the command. With the optional argument, number, you can convert the \nopagebreak command from a demand to a request. The number must be a number from 0 to 4. The higher the number, the more insistent the request is.