Test the push button on m3pi connected to p21. when button pressed led 3 will light , otherwise led 1 will light

Dependencies:   mbed

Revision:
0:40d062361f4e
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Apr 06 14:24:56 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/5e5da4a5990b
\ No newline at end of file