function mentleg() {
if (document.all)
var xMax = screen.width, yMax = screen.height;
else
if (document.layers)
var xMax = window.outerWidth, yMax = window.outerHeight;
else
var xMax = 640, yMax=480;
var xOffset = (xMax - 450)/2, yOffset = (yMax - 260)/2;
window.open('presentat/mentleg.php','windowbis','width=450,height=260,screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+',resizable=yes');
}

function contact() {
if (document.all)
var xMax = screen.width, yMax = screen.height;
else
if (document.layers)
var xMax = window.outerWidth, yMax = window.outerHeight;
else
var xMax = 640, yMax=480;
var xOffset = (xMax - 200)/2, yOffset = (yMax - 150)/2;
window.open('include/nouscont.php','windowbis','width=200,height=150,screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+',resizable=yes');
}