Window.onLoad problems

Not related to LODESTAR development but something that annoyed the hell out of me.
On one my pages the Body onLoad stop working, did not fire anymore.
So I used the script window.onload = function.
but first I used window.onload = function() and get a error message
not implemented' javascript error
BECAUSE I USED THE PARENTHESES ........WTF!!

correct syntax = window.onload = function