function openWindow(url, width, height, options) {
  var top  = (screen.height-height)/2;
  var left = (screen.width-width)/2;
  window.open(url,'','top='+top+',left='+left+',width='+width+',height='+height+','+options);
}




function launchContainerEditionWindow(vars) {
  openWindow('edit_container.php?'+'mode=ask_modif&'+vars,580, 580, 'scrollbars=no,menubar=no,resizable=yes,toolbar=no,location=no,status=no');
}

function launchContainerDeletionWindow(vars) {
  openWindow('edit_container.php?'+'mode=ask_delete&'+vars,580, 580, 'scrollbars=no,menubar=no,resizable=yes,toolbar=no,location=no,status=no');
}

function launchContentEditionWindow(vars) {
  openWindow('edit_content.php?'+'mode=ask_modif&'+vars,600, 600, 'scrollbars=no,menubar=no,resizable=yes,toolbar=no,location=no,status=no');
}

function launchContentDeletionWindow(vars) {
  openWindow('edit_content.php?'+'mode=ask_delete&'+vars,540, 560, 'scrollbars=no,menubar=no,resizable=yes,toolbar=no,location=no,status=no');
}

function launchLogonWindow() {
  openWindow('logon.php?'+'mode=ask_logon',250, 200, 'scrollbars=no,menubar=no,resizable=no,toolbar=no,location=no,status=no');
}

function launchChooseFileWindow(vars) {
  openWindow('choose_file.php?'+'mode=ask_choose&'+vars,250, 300, 'scrollbars=no,menubar=no,resizable=no,toolbar=no,location=no,status=no');
}

function launchCreateNodeWindow(vars) {
  openWindow('create_node.php?'+'mode=ask_create&'+vars,300, 150, 'scrollbars=no,menubar=no,resizable=no,toolbar=no,location=no,status=no');
}