+//////////////////////////////////////////////////////////// links
+function href ($url,$text) { return "<a href='" . $url . "'>" . $text . "</a>"; }
+
+// naming scheme is
+// l_objects() -> the url to the page that list objects
+// l_object($object_id) -> the url to hte page thas details object with given id
+// l_object_t($object_id,text) -> an <a> tag that shows text and links to the above
+// l_object_add () -> the url to that object-afding page
+
+function l_actions () { return "/db/common/actions.php"; }
+// some complex node actions are kept separate, e.g. the ones related to getbootmedium
+function l_actions_download () { return "/db/nodes/node_downloads.php"; }
+function l_register_node () { return "/registerwizard/index.php"; }
+function l_pcu_add () { return "/registerwizard/index.php/register/stage1_addpcu"; }
+function l_pcu ($pcu_id) { return "/db/sites/pcu.php?id=$pcu_id"; }
+function l_pcu_href ($pcu_id, $text) { return href(l_pcu($pcu_id), $text); }
+
+function l_nodes () { return "/db/nodes/index.php"; }
+function l_nodes_peer ($peer_id) { return "/db/nodes/index.php?peerscope=$peer_id"; }
+function l_node ($node_id) { return "/db/nodes/node.php?id=$node_id"; }
+function l_node_interfaces ($node_id) { return "/db/nodes/node.php?id=$node_id&show_interfaces=1"; }
+function l_node_tags ($node_id) { return "/db/nodes/node.php?id=$node_id&show_tags=1"; }
+function l_node_t ($node_id,$text) { return href (l_node($node_id),$text); }
+function l_node_obj($node) { return href(l_node($node['node_id']),$node['hostname']); }
+function l_node_add () { return "/db/nodes/node_add.php"; }
+function l_nodes_site ($site_id) { return "/db/nodes/index.php?site_id=$site_id"; }
+function l_nodes_my_site () { return l_nodes_site(plc_my_site_id()) . "&active_line_tab=My site nodes"; }
+function l_nodes_all_my_site () { return l_nodes_person(plc_my_person_id()) . "&active_line_tab=All My site nodes"; }
+function l_nodes_person ($person_id) { return "/db/nodes/index.php?person_id=$person_id"; }
+function l_nodes_slice ($slice_id) { return "/db/nodes/index.php?slice_id=$slice_id"; }
+
+function l_interface ($interface_id) { return "/db/nodes/interface.php?id=$interface_id"; }
+function l_interface_tags($interface_id){ return "/db/nodes/interface.php?id=$interface_id&show_tags=1"; }
+function l_interface_t ($interface_id,$text) {
+ return href (l_interface($interface_id),$text); }
+function l_interface_add($node_id) { return "/db/nodes/interface.php?node_id=$node_id"; }
+
+function l_sites () { return "/db/sites/index.php"; }
+function l_sites_peer ($peer_id) { return "/db/sites/index.php?peerscope=$peer_id"; }
+function l_site ($site_id) { return "/db/sites/index.php?id=$site_id"; }
+function l_site_t ($site_id,$text) { return href (l_site($site_id),$text); }
+function l_site_obj($site) { return href (l_site($site['site_id']),$site['name']); }
+function l_site_tags ($site_id) { return "/db/sites/site.php?id=$site_id&show_tags=1"; }
+
+function l_slices () { return "/db/slices/index.php"; }
+function l_slices_peer ($peer_id) { return "/db/slices/index.php?peerscope=$peer_id"; }
+function l_slice ($slice_id) { return "/db/slices/index.php?id=$slice_id"; }
+function l_slice_nodes ($slice_id) { return "/db/slices/index.php?id=$slice_id&show_nodes=1&show_nodes_current=1&show_nodes_add=1"; }
+function l_slice_t ($slice_id,$text) { return href (l_slice($slice_id),$text); }
+function l_slice_add () { return "/db/slices/slice_add.php"; }
+function l_slices_site($site_id) { return "/db/slices/index.php?site_id=$site_id"; }
+function l_slices_my_site() { return l_slices_site(plc_my_site_id()) . "&active_line_tab=My site slices"; }
+function l_slices_person($person_id) { return "/db/slices/index.php?person_id=$person_id"; }
+function l_slices_local() { return "/db/slices/index.php?peerscope=local"; }
+// from an object
+function l_slice_obj ($slice) { return l_slice_t ($slice['slice_id'],$slice['name']); }
+
+function l_sliver ($node_id,$slice_id) { return "/db/nodes/slivers.php?node_id=$node_id&slice_id=$slice_id"; }
+function l_sliver_t ($node_id,$slice_id,$text) {
+ return href (l_sliver($node_id,$slice_id),$text) ; }
+
+function l_persons () { return "/db/persons/index.php&active_line_tab=All Accounts"; }
+function l_persons_peer ($peer_id) { return "/db/persons/index.php?peerscope=$peer_id&active_line_tab=Local Accounts"; }
+function l_person ($person_id) { return "/db/persons/index.php?id=$person_id"; }
+function l_person_roles ($person_id) { return "/db/persons/index.php?id=$person_id&show_roles=1"; }
+function l_person_t ($person_id,$text) { return href (l_person($person_id),$text); }
+function l_persons_site ($site_id) { return "/db/persons/index.php?site_id=$site_id"; }
+function l_persons_slice ($slice_id) { return "/db/persons/index.php?slice_id=$slice_id"; }
+function l_person_obj ($person) { return l_person_t($person['person_id'],$person['email']); }
+function l_person_tags ($person_id) { return "/db/persons/person.php?id=$person_id&show_tags=1"; }
+
+function l_tags () { return "/db/tags/index.php"; }
+function l_tag ($tag_type_id) { return "/db/tags/index.php?id=$tag_type_id"; }
+function l_tag_obj ($tag) { return href(l_tag($tag['tag_type_id']),$tag['tagname']); }
+function l_tag_roles ($tag_type_id) { return "/db/tags/index.php?id=$tag_type_id&show_roles=1"; }
+
+function l_nodegroups () { return "/db/tags/nodegroups.php"; }
+function l_nodegroup ($nodegroup_id) { return "/db/tags/nodegroup.php?id=$nodegroup_id"; }
+function l_nodegroup_t ($nodegroup_id,$text) {
+ return href(l_nodegroup($nodegroup_id),$text); }
+function l_nodegroup_obj ($nodegroup) {
+ return href(l_nodegroup($nodegroup['nodegroup_id']),$nodegroup['groupname']); }
+
+function l_events () { return "/db/events/index.php"; }
+function l_event ($type,$param,$id) { return "/db/events/index.php?type=$type&$param=$id"; }
+
+function l_peers() { return "/db/peers/index.php"; }
+function l_peer($peer_id) { return "/db/peers/index.php?id=$peer_id"; }
+function l_peer_t($peer_id,$text) { return href(l_peer($peer_id),$text); }
+
+function l_comon($id_name,$id_value) { return "/db/nodes/comon.php?$id_name=$id_value"; }
+function l_sirius() { return "/db/sirius/index.php"; }
+function l_about() { return "/db/common/about.php"; }
+function l_doc_plcapi() { return "/db/doc/PLCAPI.php"; }
+function l_doc_nmapi() { return "/db/doc/NMAPI.php"; }
+function l_admin() { return "/db/common/adminsearch.php"; }
+
+function l_login() { return "/db/common/login.php"; }
+function l_logout() { return "/planetlab/common/logout.php"; }
+function l_sulogout() { return "/planetlab/common/sulogout.php"; }
+function l_reset_password() { return "/db/persons/reset_password.php"; }
+function l_person_register() { return "/db/persons/register.php"; }
+function l_site_register() { return "/db/sites/register.php"; }
+function l_sites_pending() { return "/db/sites/join_request.php"; }
+function l_site_review_pending($site_id){ return "/db/sites/join_request.php?review=t&site_id=$site_id"; }
+
+
+//////////////////////////////////////////////////////////// nav tabs
+function tab_nodes () { return array ('label'=>'All nodes','url'=>l_nodes(),
+ 'bubble'=>'Display nodes from all peers'); }
+function tab_nodes_local () { return array ('label'=>'Local nodes', 'url'=>l_nodes_peer('local'),
+ 'bubble'=>'Display all nodes local to this peer'); }
+function tab_nodes_site($site_id){ return array ('label'=>'Site nodes', 'url'=>l_nodes_site($site_id),
+ 'bubble'=>'Display nodes on that site'); }
+function tab_nodes_slice($slice_id){ return array ('label'=>'Slice nodes', 'url'=>l_nodes_slice($slice_id),
+ 'bubble'=>'Display nodes for that slice'); }
+function tab_nodes_mysite () { return array ('label'=>'My site nodes', 'url'=>l_nodes_my_site(),
+ 'bubble'=>'Display nodes on my site'); }
+function tab_nodes_all_mysite (){ return array ('label'=>'All My site nodes', 'url'=>l_nodes_all_my_site(),
+ 'bubble'=>'Display nodes on all my sites'); }
+function tab_node($node) { return array ('label'=>'Node '.$node['hostname'], 'url'=>l_node($node['node_id']),
+ 'bubble'=>'Details for ' . $node['hostname']); }
+//////////
+function tab_site($site) { return array ('label'=>'Site '.$site['login_base'], 'url'=>l_site($site['site_id']),
+ 'bubble'=>'Details for ' . $site['name']); }
+function tab_mysite() { return array ('label'=>'My site', 'url'=>l_site(plc_my_site_id()),
+ 'bubble'=>'Details for site ' . plc_my_site_id()); }
+function tab_sites () { return array ('label'=>'All sites' , 'url'=>l_sites(), 'bubble'=> 'Display all sites'); }
+function tab_sites_local () { return array ('label'=>'Local sites' , 'url'=>l_sites_peer('local'),
+ 'bubble'=> 'Display all siteslocal to this peer'); }
+//////////
+function tab_slices() { return array ('label'=>'All slices', 'url'=>l_slices(),
+ 'bubble' => 'Display all slices'); }
+function tab_slices_person() { return array ('label'=>'My slices', 'url'=>l_slices_person(plc_my_person_id()),
+ 'bubble' => 'Display my all slices'); }
+function tab_slices_mysite () { return array ('label'=>'My site slices', 'url'=>l_slices_my_site(),
+ 'bubble'=>'Display all slices on my site'); }
+function tab_slices_local () { return array ('label'=>'Local slices', 'url'=>l_slices_local(),
+ 'bubble'=>'Display all slices local to this peer'); }
+function tab_slice($slice) { return array ('label'=>'Slice '.$slice['name'], 'url'=>l_slice($slice['slice_id']),
+ 'bubble' => 'Details for ' . $slice['name']); }
+//////////
+function tab_persons() { return array ('label'=>'All Accounts', 'url'=>l_persons(),
+ 'bubble'=>'Display users from all peers'); }
+function tab_persons_local() { return array ('label'=>'Local Accounts', 'url'=>l_persons_peer('local'),
+ 'bubble'=>'Display all users local to this peer'); }
+function tab_persons_mysite() { return array ('label'=>'My site accounts' , 'url'=>l_persons_site(plc_my_site_id()),
+ 'bubble'=>'Display accounts on site ' . plc_my_site_id()); }
+function tab_person($person) { return array ('label'=>'Account '.$person['email'], 'url'=>l_person($person['person_id']),
+ 'bubble'=>'Details for ' . $person['email']); }
+//////////
+function tab_tags() { return array ('label'=>'Tag Types', 'url'=>l_tags(),
+ 'bubble' => 'Display and create tag types'); }
+function tab_nodegroups() { return array ('label'=>'Nodegroups', 'url'=>l_nodegroups(),
+ 'bubble' => 'Display and create nodegroups'); }
+
+// only partial tab
+function tablook_event() { return array('image'=>'/planetlab/icons/event.png','height'=>18);}
+function tablook_comon() { return array('image'=>'/planetlab/icons/comon.png','height'=>18);}
+
+
+
+//////////////////////////////////////////////////////////// validation functions
+function topdomain ($hostname) {
+ $exploded=array_reverse(explode(".",$hostname));
+ return $exploded[0];