var minWidth = 950;
var minHeight = 580;
function tailleSite(){
	
	if (document.body){
		var larg = (document.body.clientWidth);
		var haut = (document.body.clientHeight);
	}else{
		var larg = (window.innerWidth);
		var haut = (window.innerHeight);
	}
	obj = document.getElementById("siteIE");
	obj.style.height = (haut > minHeight)? "100%" : minHeight + "px";
	obj.style.width  = (larg > minWidth)? "100%" : minWidth + "px";
	return true;
}

window.onresize = tailleSite;