eclipse php deployment problems?

hello:

  recently, I downloaded eclipse and installed php IDE of eclipse, however, i cannot deploy my project, i checked help, it tells me that I need to specify the web server location, which is localhost, and specify a php executable, and debugger, however, i do not find a php executable, rather it show me php enviroment subsection of preferences setting in window menu, i choose one version, perhaps the latest version of php, and try to run a demo project, but cannot connect to server, and i try to run as an application, it refused me saying no php server found

how to troubleshoot that problem

thanks