// JavaScript Document
function bgd()
{
	var bdroite = document.getElementById('bdroite');
	var bgauche = document.getElementById('bgauche');
	var btop = document.getElementById('btop');
	var swidth = document.body.clientWidth;
	var sheigth = document.body.clientHeight;
	
	var sizediv = '';
	sizediv = (swidth-985)/2;
	
	bdroite.style.width=sizediv+'px';
	bgauche.style.width=sizediv+'px';
	btop.style.width=swidth+'px';
	
	bdroite.style.height=sheigth+'px';
	bgauche.style.height=sheigth+'px';
	
	bgauche.style.left=0;
	btop.style.left=0;
	bdroite.style.right=0;
	
}
window.onresize = bgd();