function getBrowserWidth(){
	if (window.innerWidth){
		return window.innerWidth;}
	else if (document.documentElement && document.documentElement.clientWidth != 0){
		return document.documentElement.clientWidth; }
	else if (document.body){return document.body.clientWidth;}
		return 0;
}

function changeBanner(){
    if (getBrowserWidth() < 1100){
		document.getElementById("header").style.background='#dcd9c0 url(http://www.unodc.org/misc/nds/img/headersmall.gif) no-repeat';
		document.getElementById("contentleft").style.width='45%';
		document.getElementById("contentright").style.width='30%';
		}
}