Q: how can I download java as my version is OX MAC 10.5.8

Surprised you don't already have it. Latest updates:

Update 9 March 8, 2011 - Java for Mac OS X 10.5 Update 9 delivers improved compatibility, security, and reliability by updating J2SE 5.0 to 1.5.0_28, and updating Java SE 6 to 1.6.0_24 for 64-bit capable Intel-based Macs. J2SE 1.4.2 is no longer being updated to fix bugs or security issues and remains disabled by default in this update. This is a Combo update: Update 9 supersedes all previous updates of Java for Mac OS X v10.5.  http://support.apple.com/kb/DL1359

Update 10, 29 June 2011 - This release updates J2SE 5.0 to 1.5.0_30, and updates Java SE 6 to 1.6.0_26. J2SE 1.4.2 is no longer being updated to fix bugs or security issues and remains disabled by default in this update. Support for out-of-process Java applets on Mac OS X 10.5 Leopard has been removed with this update.

This release is only for Mac OS X 10.5.8 or later versions of Mac OS X 10.5. http://support.apple.com/kb/DL1359

Since August 2012 updates for Java (and especially Java Runtime Environment, which is what you actually need) must now be downloaded direct from Oracle:

http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1637588.h tml

Further information here:

http://www.oracle.com/us/corporate/press/1735645

and their FAQ’s:

http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/mac-faq.html

However, if you need the Jave 6 JRE and plug-in, MadMAC0 has posted at

https://discussions.apple.com/message/20107182?ac_cid=tw123456#20107182

Apple has also posted (Oct 22/12) the approved solution for restoring the Java 6 plug-in:

Java for OS X 2012-006: How to re-enable the Apple-provided Java SE 6 applet plug-in and Web Start functionality.