function resizeOverflows()
{
	var cW = document.documentElement.clientWidth ;
	var cWmL = Math.round(cW / 2);
	var oW1 = 0 , oW2 = 0 ;
	var overflowsWidth = cW - 880 ;
	
	if(overflowsWidth > 0)
	{
		oW1 = Math.round(overflowsWidth / 2) ;
		oW2 = overflowsWidth - oW1 ;
	}

	document.getElementById("div_overflow_left").style.width = oW1+"px";
	document.getElementById("div_overflow_right").style.width = oW2+"px";
	
	if(oW1 == 0)
		document.getElementById("div_conteneur").style.width = "880px";
	else
		document.getElementById("div_conteneur").style.width = cW+"px";
}

window.onresize = resizeOverflows;