Collision creation script issues

(
----------------------------------------------------------------Design-------------
rollout collCreation "Collision Creator"
	(
		group "Create Collision"
		(
		button coll_btn "Create Collision" align:#center
		)
		on coll_btn pressed do
		(
			selectedObjs = getCurrentSelection()
			for i = 1 to selectedObjs.Count do
			(
-------------------------FUNCTIONS------------------------------------------------
				fn maximum a b = 
				(
					if a > b then return b
						return a
				)
				fn minimum a b = 
				(
					if a < b then return b
						return a
				)
---------------------End FUNCTIONS----------------------------------------------
				local objName = selectedObjs[i].name as string
				objFaces = polyop.getFaceSelection selectedObjs[i]
				objVerts = polyop.getVertsUsingFace selectedObjs[i] objFaces
 
				boxMin = point3 0 0 0
				boxMax = point3 0 0 0
 
				vertPrime == true
 
				for i = 1 to objVerts.count do
				(
					if objVerts[i] == true do
					(
						cV = objVerts[i]
						if vertPrime == true then
						(
							boxMin.x = cV.pos.x
							boxMin.y = cV.pos.y
							boxMin.z = cV.pos.Z
							boxMax.x = cV.pos.x
							boxMax.y = cV.pos.y
							boxMax.z = cV.pos.z
							vertPrime = false
						)
						else 
						(
							boxMin.x = minimum cV.pos.x boxMin.x
							boxMin.y = minimum cV.pos.y boxMin.y
							boxMin.z = minimum cV.pos.z boxMin.z
							boxMax.x = maximum cV.pos.x boxMax.x
							boxMax.y = maximum cV.pos.y boxMax.y
							boxMax.z = maximum cV.pos.z boxMax.z
						)
					)
				)
				center = point3 0 0 0
				center.x = (boxMax.x - boxMin.x) * .5 + boxMin.x
				center.y = (boxMax.y - boxMin.y) * .5 + boxMin.y
				center.z = (boxMax.z - boxMin.z) * .5 + boxMin.z
				(
					bW = (boxMax.x - boxMin.x)
					bL = (boxMax.y - boxMin.y)
					bH = (boxMax.z - boxMin.z)
					bC = center - [0 , 0 , (bH/2)]
 
					newColl = Box name:("UCX_" + objName) length:bL width:bW height:bH pos:bC
					convertToPoly newColl
				)
			)
		)
	)
--------------End Design---------------------------------------------------
createDialog collCreation width:200
cui.RegisterDialogBar collCreation style:#(#cui_floatable,#cui_dock_left,#cui_dock_right,#cui_handles)
)