ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;
w3c = (document.getElementById)? true:false;

function showLyr(id) {
	if (ns4) {
		document.layers[id].visibility = "show";
	}
	else if (ie4) {
		document.all[id].style.visibility = "visible";
	}
	else if (w3c) {
		document.getElementById(id).style.visibility = "visible";
	}
}

function hideLyr(id) {
	if (ns4) {
		document.layers[id].visibility = "hide";
	}
	else if (ie4) {
		document.all[id].style.visibility = "hidden";
	}
	else if (w3c) {
		document.getElementById(id).style.visibility = "hidden";
	}
}

function display_banner() {
	if (document.body && document.body.offsetWidth) {
		if(document.body.offsetWidth < 1180) {
			hideLyr("banner");
		} else {
			showLyr("banner");
		}
	}
	if (document.compatMode=='CSS1Compat' &&
	    document.documentElement &&
	    document.documentElement.offsetWidth ) {
	   	if(document.documentElement.offsetWidth < 1180) {
			hideLyr("banner");
		} else {
			showLyr("banner");
		}	
	}
	if (window.innerWidth && window.innerHeight) {
		if(window.innerWidth < 1180) {
			hideLyr("banner");
		} else {
			showLyr("banner");
		}		
	}
}