How to change the error message contents of ISA Server

Hello :
Is there any way to change the contents error Page  of ISA server that comes up when trying to access Denied web site
The error Page contents like this
 Network Access Message: The page cannot be displayed  
 Explanation: There is a problem with the page you are trying to reach and it cannot be displayed.

Try the following:
Refresh page: Search for the page again by clicking the Refresh button. The timeout may have occurred due to Internet congestion.
Check spelling: Check that you typed the Web page address correctly. The address may have been mistyped.
Access from a link: If there is a link to the page you are looking for, try accessing the page from that link.
If you are still not able to view the requested page, try contacting your administrator or Helpdesk.
 Technical Information (for support personnel)
Error Code: 502 Proxy Error. The ISA Server denied the specified Uniform Resource Locator (URL). (12202)
IP Address:
Date: 11/28/2007 8:24:14 PM [GMT]
Source: proxy

So i need to change these contents to be friendly tect for users
how can i do that ?
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