You are addressing the graphs in your gauges page http://www.it-temp.com/ as:
http://www.it-temp.com/images/temp+hum_24hr.php
They are not there so you get a:
Failed to load resource: the server responded with a status of 404 (Not Found)
The graphs seem to be at:
http://it-temp.com/wxgraphs/temp+hum_24hr.php
Check your scripts/gauges.js settings at line 38 to point to the correct location, it is now:
imgPathURL : './images/', // *** Change this to the relative path for your 'Trend' graph images
change to
imgPathURL : './wxgraphs/', // *** Change this to the relative path for your 'Trend' graph images
Wim