Fix PHP warnings.

www/beginexp_form.php3

@@ -560,7 +560,8 @@ function SPITFORM($formfields, $errors)
 		  <td><input type='checkbox'
 			 name='formfields[exp_idleswap]'
 			 value='1'";
-	if ($formfields['exp_idleswap'] == "1") {
+	if (isset($formfields['exp_idleswap']) &&
+	    $formfields['exp_idleswap'] == "1") {
 	    echo " checked='1'";
 	}
 	echo "></td>

www/experiment_defs.php

@@ -5,6 +5,8 @@
 # All rights reserved.
 #
 #
+include_once("template_defs.php");
+
 # This class is really just a wrapper around the DB data ...
 #
 # A cache to avoid lookups. Indexed by node_id.

www/showexp.php3

@@ -7,7 +7,7 @@
 include("defs.php3");
 require("Sajax.php");
 include("showstuff.php3");
-include("template_defs.php");
+include_once("template_defs.php");
 sajax_init();
 sajax_export("GetExpState", "Show", "ModifyAnno");