CHECK IF PASSWORD IS SECURE

Hello experts
I have a registration page and i need a script to check how secure the imported password is.Something like
the yahoo registration (https://edit.europe.yahoo.com/registration?.intl=us&new=1&.done=http%3A//mail.yahoo.com&.src=ym&.v=0&.u=ful6umh4e1nk0&partner=&.partner=&pkg=&stepid=&.p=&promo=&.last=)
or something else.
My field is:
<input name="Password" type="password" class="textfieldRegister" id="Password" value=""  maxlength="12" />
(I use Coldfusio and sql)
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PanosAsked:
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MMDeveloperCommented:
depends on how you want to score passwords.. Here's some code I ripped off microsoft a while back


http://mmdeveloper.selfip.com/SourceCode/JavaScript/MMPasswordStrengthPreview.html
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PanosAuthor Commented:
Hi.
I will allow   only letters and numbers.The script you posted is very good but it allows special characters too(or not?) and it is very difficult for a user to get a <best password>.
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PanosAuthor Commented:
Hi.
Thank you for  your help.
regards
panos
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