deploy app outsite Tomcat_install_dir

[blue sky]

Hi all
I want to deploy 1 web application in directory outsite Tomcat_install_dir but I ca'nt. For example :
Tomcat_install_dir : d:\Tomcat
I want to put my application in : c:\myapp
I did like this :
I config in web.xml:
<context path = "/myapp" docbase = "c:\myapp" reloadble = "true">
</context>
But it dosen't work.
please help me!
thanks