sketch_mar07a.cpp:10:1: error: ‘EthernetClient’ does not name a type
sketch_mar07a.cpp: In function ‘void setup()’:
sketch_mar07a.cpp:15:25: error: no matching function for call to ‘EthernetClass::begin(byte [6])’
You need to address the issues in the order that they are listed. Which version of the IDE are you trying to compile this code on?
When I try compiling it on 1.0, the only "error" I get is:
Binary sketch size: 12984 bytes (of a 30720 byte maximum)