The short of it is: Is it costly to check an Application Variable such as Application("WebAppName") more 10-20 times each time a page loads?

Background: (feel free to critique)

Some includes in my site contain many links and images which cannot use relative urls due to their inclusion in different paths.

Hence these includes contain frequent instances of

<img src="<%=Application("Webroot")%>images\image.gif">

Is it expensive to keep calling an Application variable like this?

Should I just put the Application value in some local variable to use where needed?

IMPORTANT NOTE:

I need my webapp to run fine on a server whether it be in the root web ("/") or in a virtual subweb ("/app").

Thanks in advance for any wisdom shared.