Parametrized X-rod mount

Title shows what this is.
Just an OpenSCAD Script based on Twotimes' X-Rod Mount.

Some codes was borrowed from Giles Bathgate( http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Libraries ) and whosawhatsis( http://www.thingiverse.com/thing:3457 ). Thanks. I really appreciate it.

I don't know which licence is suitable, because I borrowed some code and don't know how to inherit their licenses.
Except it, you can copy and modify this script.

Update:
v01 - changed cylinder function to 200_gon_prizm, so bolt holes turn to smoother.
V02 - applied "Incomplete Polygons" design ( http://blog.makerbot.com/2010/12/13/design-tip-incomplete-polygons/ ) and ( http://blog.makerbot.com/2010/12/13/incomplete-polygons-–-a-dramatization/ ). Four holes has 0.1mm slices to avoid blobs. Rounded corners. Holes were enlarged by 5%, reflected a sugestion by kitsu. So no need to drill out holes.
V03 - changed licence to Creative Commons - GPL license.
V04 - modified teardrop function for smoo