ie7.0.6 vista error HELP

[eluser]dbashyal[/eluser]
Hi,
can anyone know how can i fix this error for ie7.0.6 for vista as it is fine in rest of the browsers.

error, showing false on dropdown menu

location: http://www.acidgreen.com.au/projects/pulse/production/

[eluser]thinkigniter[/eluser]
This may be a JS object conflict.

Try commenting out one JS Framework at a time to see what happens.

But leave Jquery, of course.

Good Luck.