Hi Davis,
Thank you very much for your clean response and help but I am very sorry, after doing all the settings that you have described also, I am unable to launch the catalogue.
And this time I even unable to launch it after refreshing(F5) the blank white page of the catalogue as in my previous case, instead getting the same blank popup window again and again after refreshing the page also. Can you please tell me if we need to add some other parameters in the call structure or any other settings have to be followed in IE8 ??
Thank you once again.