testing

hello all, my first time posting altho i've been reading the lists a while
now. tim mentioned VMWare as the best tool for testing, i'm wondering about
a group consensus? i've just been using free tools for testing but as you
can imagine they don't quite do the trick with javascripting. and, where do
i find these great and wonderful tools?

also, related to testing, i have a javascript glitch that is only showing up
in IE4 but works fine in others. any hints on how to test in alternate
versions of browsers? the tester i'm using just gives a general 'warning'
for different browser versions.

tia
kim

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