How do people figure out if the FTSE will open higher or lower tomorrow?

this sort of thing ?

<img src="http://chart.bigcharts.com/bc3/intchart/frames/chart.asp?symb=uk%3AFtse+250&compidx=SP500%3A3377&ma=0&maval=9&uf=0&lf=1&lf2=0&lf3=0&type=2&size=3&state=8&sid=125174&style=380&time=7&freq=1&comp=NO%5FSYMBOL%5FCHOSEN&nosettings=1&rand=3198&mocktick=1">
 
Excellent BB

Thanks everyone.

:)

SMI seems a bit slow in comparism.
 
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