Both "toeing" and "towing" are acceptable spellings for this usage.
http://en.wikipedia.org/wiki/Toe_the_line
'Sometimes this phrase is written "tow the line," an eggcorn changing the meaning of the phrase from conformance with a rule to contribution to a cause or effort, as in the act of pulling something with a line, the way a canal man would along a barge canal's towpath.'
thats where i got it. either way it might behoove me to know things like that. thanks zit. i guess i do learn something everyday