Grab local HTML and alert me based on a threshold

Hi experts.
I'm looking for something that may not exist or may be too hard to make.  I want a little program that can monitor a local webpage and then alert me whenever a particular value in a table equals 0.  The webpage is built-in to a local appliance.  It updates every 10 secs, but it's very simple so there's no feature to report or alert on it's data.  I need this tool to be able to run as a service and then do something useful like email me when the alert threshold is reached.  There is also a basic username/password to access this page, so it'd be great if that was able to be configured too, but it probably doesn't matter as I'll login once and then it will be able to keep refreshing without asking for the login again.

This could run on a 2008 server or XP machine.  Does anyone know of a piece of software that could do this, or know how to do it myself perhaps with Powershell?
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theras2000Asked:
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theras2000Connect With a Mentor Author Commented:
Don't wory.  I finally found some sites that look like they'll teach me how to do it in Powershell http://poshcode.org/561 and http://www.scriptinganswers.com/forum2/forum_posts.asp?TID=3906
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Lukasz ChmielewskiCommented:
What is the web server ?
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theras2000Author Commented:
OK a bit more digging around has given me some info, but not heaps.  The webpage isn't coming from an appliance, but from the server that I control.  I believe that the web server is probably built-in to a running service which runs constantly.  This is how many other services work which were created by the same person.  It somehow pulls a file called template.htt, which uses javascript to fill in the dynamic values on the page.  The page is very basic .. just a header, the javascript reference, and then a table full of rows and such.

I have tried using 'netstat -a -b' to discover exactly where the web port (81) comes from, but it says I can't obtain ownership information to display the exe filename (presumably a permissions issue).  Other possibilities are an Apache server residing on the server, but I've looked at the config (httpd.conf) and it's only serving one static page on port 82 (as far as I can tell).
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Lukasz ChmielewskiCommented:
can you place your php scripts on that server ?
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theras2000Author Commented:
Unfortunately no.  It runs critical services setup by another company, so I can't interfere with it.  That's why I wanted something that can run elsewhere and just monitor the webpage.
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