add discount or image or attribute problem

When I try to add discount or image or attribute in product listing nothing pops up and I get yellow triangle at the bottom of IE8 (done with errors).

I changed real website name with domain.com

Below are error messages I get from IE8

Main product webpage error


User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; .NET CLR 1.1.4322)
Timestamp: Tue, 28 Feb 2012 17:46:42 UTC


Message: HTML Parsing Error: Unable to modify the parent container element before the child element is closed (KB927917)
Line: 0
Char: 0
Code: 0
URI: http://www.domain.com/admin/index.php?r ... 680da920e3


Product Edit Webpage error details when I try to add discount

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; .NET CLR 1.1.4322)
Timestamp: Thu, 23 Feb 2012 22:39:10 UTC


Message: Object expected
Line: 563
Char: 1
Code: 0
URI: http://www.domain.com/admin/index.php?r ... duct_id=51