I downloaded and installed the following extensions:

• Advanced Layer PopUp
• Universal CSS Navigation Menu
• DMXzone Lightbox

I got the following error:
While executing onClick in AdvLayerPopUp10_install.htm, the following JavaScript error(s) occurred:
At line 1 of file
"C:\Users\Roxana\AppData\Roaming\Adobe\Dreamweaver\CS5.5\en_US\Configuration\shared\DMXzone\Scripts\dmxInstaller103.js":
getDocumentDOM: Argument number 1 is invalid.

Please help