function tips_popup (my_url) {
  winContent = window.open( my_url, 'tips', 'left=50, top=50, width=500, height=200, toolbar=no, scrollbars=no, resizable=no' ) ;
}


function help_popup (my_url) {
  winContent = window.open( my_url, 'help', 'left=50, top=50, width=800, height=400, toolbar=no, scrollbars=yes, resizable=yes' ) ;
}


function list_popup (my_url) {
  window.open( my_url, 'list_window', 'left=50, top=50, width=300, height=400, toolbar=no, scrollbars=yes, resizable=yes' ) ;
}