function popup(page,ht,lg,top){
	x=((screen.width-lg)/2);
	if(top)y=((screen.height-ht)/2);
	else y=0;
	var popup = window.open(page,"pop","width="+lg+",height="+ht+",left="+x+",top="+y+",toolbar=0,scrollbars=yes,resizable=no");
}

function popupG(page,ht,lg,top){
	x=((screen.width-lg)/2);
	if(top)y=((screen.height-ht)/2);
	else y=0;
	var popup = window.open(page,"pop","width="+lg+",height="+ht+",left="+x+",top="+y+",toolbar=0,scrollbars=no,resizable=no");
}
	
function printWindow() {
	bV = parseInt(navigator.appVersion);
	if (bV >= 4) window.print();
}

<!-- Cas si l'ordinateur est un PC -->

if (navigator.platform.indexOf("Win")  != -1) {
		if ((navigator.appName=="Netscape") && (parseInt(navigator.appVersion)==4)){
			{
				document.write("<link rel='stylesheet' href='styles/ns.css'>");
			}
		}
		else{
			document.write("<link rel='stylesheet' href='styles/ie.css'>");
			}
		}
<!-- Cas d'un autre ordinateur -->
else if (navigator.platform.indexOf("Win") == -1) {
	document.write("<link rel='stylesheet' href='styles/mac.css'>");
}