// JavaScript Document

var cadre = document.getElementById('cadre');
	margin_top = (window.innerHeight-600)/2;
if (margin_top < 0)
	{
		margin_top = 0;
	}
cadre.style.marginTop = margin_top + 'px';
	margin_left = (window.innerWidth-960)/2;
if (margin_left < 0)
	{
		margin_left = 0;
	}
cadre.style.marginLeft = margin_left + 'px';