Ajax Control Toolkit not working on IE8

I am using Ajax Control Toolkit version 40412 in my asp.net 4.0 website. When I run the page in Firefox it is working good but I run the page in IE8 it is not rendering toolkit controls and putting "//" characters on the bottom of page.This is happening with every control of toolkit. What can be the problem with开发者_StackOverflow社区 this, any ideas?

Are you sure that you are using the ToolScriptManager and not the Scriptmanager?