OK, It's working now. Instead of running startup.bat (Tomcat) I created a 
batch file in which i set the proper values for JAVA_HOME, TOMCAT_HOME, 
etc. and i run tomcat.. Like this:

@echo on
set JAVA_HOME=C:\jdk1.3
set CLASSPATH=C:\jdk1.3\lib\tools.jar;.
set ANT_HOME=C:\program files\apache group\jakarta-tomcat
set TOMCAT_HOME=C:\program files\apache group\jakarta-tomcat

cd %TOMCAT_HOME%\bin
tomcat.bat run