This will set the display of mixed content to enable for the internet zone. Tested this on XP SP2 and IE6. Don't know if it works on other version.
You could use regshot to find the reg stuff to change, I did and it works great.

Regshot at majorgeeks.com

Code:

;sets display mixed content to enabled in the internet zone (IE6). 0 = prompt, 1 = enabled, 3 = disabled.
$rc = WriteValue("HKU\" + @SID + "\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3", "1609", "1", "REG_DWORD")

_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.