Unable to locate tools.jar. Expected to find it in...

Hello, I setup Ant but this message come across: Unable to locate tools.jar. Expected to find it in C:\program files\java\jre1.5.0_01\lib\tools.jar What is going wrong? Thanks!   Regards, Sam Hwang 

ANT_HOME is set incorrectly or ant could not be locatated. Please set ANT_HOME.

Hello, As a beginner of Ant, I use the command set ant_home=D:\apache-ant-1.6.2\bin to setup my ant, but resulted a message as title. How to correct it? Thanks!   Regards, Sam Hwang