Distance between a point and a line

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ima747

I need to find the distance from a point to a line.

using the math I found at
http://local.wasp.uwa.edu.au/~pbourke/geometry/pointline/

I came up with

distance = ( (Point.X - LineStart.X)*(LineEnd.X - LineStart.X) + (Point,Y - LineStart.Y)*(LineEnd.Y - LineStart.Y) ) / Sqr( (LineEnd.X-LineStart.X)*(LineEnd.X-LineStart.X) - (LineEnd.Y-LineStart.Y)*(LineEnd.Y-LineStart.Y) )

But all it gets me is the distance from the linestart. The math is making my head spin, does anyone have a function or non-broken equation for this?