function popup(fichier)
{
window.open
(fichier, "popup", "toolbar=no, location=no, directories=no, resizable=no, scrollbars=yes, width=550, height=420");
}

//to customize each popup size
function popup_histoire(fichier)
{
window.open
(fichier, "popup", "toolbar=no, location=no, directories=no, resizable=no, scrollbars=yes, width=550, height=500");
}

function popup_platane(fichier)
{
window.open
(fichier, "popup", "toolbar=no, location=no, directories=no, resizable=no, scrollbars=yes, width=550, height=690");
}

function popup_pratique(fichier)
{
window.open
(fichier, "popup", "toolbar=no, location=no, directories=no, resizable=no, scrollbars=yes, width=550, height=660");
}