Summary grid loading in IE7 Standards mode but gives a script error IE8 Mode in IE8

Hi I m using smartclient version 6.5/LGPL Deployment for my application. When I open my application in IE7 it works fine, when I open my application in IE7 Standard document mode or in Quirks mode document mode in IE8 it works fine but when I open my application in IE8 in IE8 Standards document mode the grid doesnt load and the code throws a script error which says "Object required ISC_Core.js, line 1549 character 67". ISC_Core.js is a javascript file which is in isomorphic\system\modules of the smartclient framework. So please let me know what needs to be done to make it run in IE8 Standards mode in IE8?
Thanks & Regards