how to start stop tomcat server using CMD?

I set the path for the tomcat and set all variables like

1. JAVA_HOME=C:\Program Files (x86)\Java\jdk1.6.0_22
2. CATALINA_HOME=G:\springwork\server\apache-tomcat-6.0.29
3. CLASSPATH=G:\springwork\server\apache-tomcat-6.0.29\lib\servlet-api.jar;G:\springwork\server\apache-tomcat-6.0.29\lib\jsp-api.jar;.;

When I go to bin folder and double click on startup.bat then my tomcat starts and when I double click on shutdown.bat tomcat stops.

But I want using CMD start and stop the tomcat. And in any folder I write command startup.bat the server will start and when I write shutdown.bat the server will stop.