Newbie question about variable scope in Apache 2.0 & PHP

I have just started working with PHP and "web programming" in general. I have done client server database programming for years. I am having trouble with variables remaining in scope between forms and scripts. I keep getting errors saying $val1 is not defined etc. This should work as I can run it on a IIS server but that server is using CGI. I'm pretty this is something simple that I am missing. Thanks in advance for any help on this as I would rather use Apache. The script i'm using to test with is very simple. I have the following form: <html> <head> <title> Type_Document_Title_Here </title> <meta name="Test Website" content="blah"> </head> <body> <form method="post" action="calculate.php"> <p>value 1: <input type = "text" name = "val1" size=10></P> <p>value 2: <input type = "text" name = "val2" size=10></P> <p><input type="submit" name="submit" value="calc3"></P> </form> </body> </html> ****The script it calls is:**** <? echo "$val2"; if (($val1 == "") || ($val2 == "")) { echo "No values entered"; exit; } $result = $val1 + $val2; ?> <html> <head> <title> calc result </title> </head> <body> <p>The result is: <? echo "$result"; ?></p> </body> </html> ***Error I get from server*** Notice: Undefined variable: val2 in C:\Program Files\Apache Group\Apache2\htdocs\calculate.php on line 2 Notice: Undefined variable: val1 in C:\Program Files\Apache Group\Apache2\htdocs\calculate.php on line 3 No values entered ***phpinfo() is as follows:*** System Windows NT localhost 4.0 build 1381 Build Date Feb 15 2003 23:02:25 Server API Apache 2.0 Filter Virtual Directory Support enabled Configuration File (php.ini) Path C:\WINNT\php.ini PHP API 20020918 PHP Extension 20020429 Zend Extension 20021010 Debug Build no Thread Safety enabled Registered PHP Streams php, http, ftp, compress.zlib This program makes use of the Zend Scripting Language Engine: Zend Engine v1.3.0, Copyright (c) 1998-2002 Zend Technologies ---------------------------------------------------------------------------- ---- PHP Credits ---------------------------------------------------------------------------- ---- Configuration PHP Core Directive Local Value Master Value allow_call_time_pass_reference On On allow_url_fopen On On always_populate_raw_post_data Off Off arg_separator.input & & arg_separator.output & & asp_tags Off Off auto_append_file no value no value auto_prepend_file no value no value browscap no value no value default_charset no value no value default_mimetype text/html text/html define_syslog_variables Off Off disable_functions no value no value display_errors On On display_startup_errors Off Off doc_root no value no value docref_ext no value no value docref_root http://www.php.net/ http://www.php.net/ enable_dl On On error_append_string no value no value error_log no value no value error_prepend_string no value no value error_reporting 2047 2047 expose_php On On extension_dir c:\php\extensions\ c:\php\extensions\ file_uploads On On gpc_order GPC GPC highlight.bg #FFFFFF #FFFFFF highlight.comment #FF8000 #FF8000 highlight.default #0000BB #0000BB highlight.html #000000 #000000 highlight.keyword #007700 #007700 highlight.string #DD0000 #DD0000 html_errors On On ignore_repeated_errors Off Off ignore_repeated_source Off Off ignore_user_abort Off Off implicit_flush Off Off include_path .;c:\php4\pear .;c:\php4\pear log_errors Off Off log_errors_max_len 1024 1024 magic_quotes_gpc On On magic_quotes_runtime Off Off magic_quotes_sybase On On max_execution_time 30 30 max_input_time 60 60 open_basedir no value no value output_buffering no value no value output_handler no value no value post_max_size 8M 8M precision 12 12 register_argc_argv On On register_globals Off Off report_memleaks On On safe_mode Off Off safe_mode_exec_dir no value no value safe_mode_gid Off Off safe_mode_include_dir no value no value sendmail_from support@futurephase.com support@futurephase.com sendmail_path no value no value short_open_tag On On SMTP ntweb ntweb smtp_port 25 25 sql.safe_mode Off Off track_errors Off Off unserialize_callback_func no value no value upload_max_filesize 2M 2M upload_tmp_dir C:\PHP\uploadtemp C:\PHP\uploadtemp user_dir no value no value variables_order EGPCS EGPCS xmlrpc_error_number 0 0 xmlrpc_errors Off Off y2k_compliance On On Apache 2.0 bcmath BCMath support enabled calendar Calendar support enabled com Directive Local Value Master Value com.allow_dcom Off Off com.autoregister_casesensitive On On com.autoregister_typelib Off Off com.autoregister_verbose Off Off com.typelib_file no value no value ctype ctype functions enabled ftp FTP support enabled interbase Interbase Support enabled Revision $Revision: 1.91 $ Dynamic Module yes Allow Persistent Links Yes Persistent Links 0/unlimited Total Links 0/unlimited Timestamp Format %m/%d/%Y %H:%M:%S Date Format %m/%d/%Y Time Format %H:%M:%S mysql MySQL Support enabled Active Persistent Links 0 Active Links 0 Client API version 3.23.49 Directive Local Value Master Value mysql.allow_persistent On On mysql.connect_timeout -1 -1 mysql.default_host no value no value mysql.default_password no value no value mysql.default_port no value no value mysql.default_socket no value no value mysql.default_user no value no value mysql.max_links Unlimited Unlimited mysql.max_persistent Unlimited Unlimited mysql.trace_mode Off Off odbc ODBC Support enabled Active Persistent Links 0 Active Links 0 ODBC library Win32 Directive Local Value Master Value odbc.allow_persistent On On odbc.check_persistent On On 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