I'm having trouble trying to figure out why on the home page there's a script error from both IE7 & IE8

"An error has occurred in the script on this page.
Line: 49
Char: 5
Error: Object doesn't support this property or method
Code: 0
URL: http://gopureenergy.com/

I'm not familiar with how the IE Debugging tool works but could use some help on how I can find the error with this tool and possibly solve the problem.