function envoi_ami() {
if (document.all)
var xMax = screen.width, yMax = screen.height;
else
if (document.layers)
var xMax = window.outerWidth, yMax = window.outerHeight;
else
var xMax = 1024, yMax=768;
var xOffset = (xMax - 800)/2, yOffset = (yMax - 600)/2;
window.open('envoyer-a-un-ami.php','ami',
'width=520,height=400,scrollbars=yes,resizable=yes, screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
}

function mentions_legales() {
if (document.all)
var xMax = screen.width, yMax = screen.height;
else
if (document.layers)
var xMax = window.outerWidth, yMax = window.outerHeight;
else
var xMax = 1024, yMax=768;
var xOffset = (xMax - 800)/2, yOffset = (yMax - 600)/2;
window.open('ecrivains-consult-mentions-legales.html','mentions',
'width=820,height=450,scrollbars=yes,resizable=yes, screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
}