issue adding cases and selection related to field.

issue adding cases and selection related to field.

I have an issue in IE8 right now , when i start a new case and look up he related to field zoho will not let me select the name in the field. i get the following Java script error. 


Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E; InfoPath.3)
Timestamp: Thu, 27 Mar 2014 14:35:44 UTC


Message: Script error
Line: 0
Char: 0
Code: 0