Preserve current url when logging in. Pass the current url as part of the url to the login form

so we can return the user to the starting url after login.

include/form_login.php

@@ -6,7 +6,10 @@ require_once(BASE."include/util.php");
 /**************/
 echo "<div class='default_container'>\n";
 echo '<form method="post" name="sFlogin" action="account.php">',"\n";
-echo html_frame_start("Login to Application DB","400","",0)
+echo html_frame_start("Login to Application DB","400","",0);
+/* Pass on the URL we should return to after log-in */
+global $aClean;
+echo '<input type="hidden" name="sReturnTo" value="'.$aClean['sReturnTo'].'" />';
 ?>
 
 <!-- start of login form -->