// Try to determine browser.
var isMinNS4 = document.layers;
var ie = document.all && navigator.userAgent.indexOf( "Opera" ) == -1;
var dom = document.getElementById && !ie && navigator.userAgent.indexOf( "Opera" ) == -1

function getObject( obj ) {
	var strObj = null;
	if ( dom ) {
		strObj = document.getElementById( obj );
	}
	if( ie ) {
		strObj = document.all.item( obj );
	}
	return strObj;
}

function hideLayer( layer ) {
	try { 	getObject( layer ).style.display = 'none'; }
	catch( e ) {}
}

function showLayer( layer ) {
	try { 	getObject( layer ).style.display = 'block'; }
	catch( e ) {}
}

function stateLayer( layer ) {
	try { 	return getObject( layer ).style.display; }
	catch( e ) {}
}

function CheckWidth() {
	var myWidth = 0;
	var myHeight = 0;
	if( typeof( window.innerWidth ) == 'number' ) {
		//Non-IE
		myWidth = window.innerWidth;
		myHeight = window.innerHeight;
	} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
		//IE 6+ in 'standards compliant mode'
		myWidth = document.documentElement.clientWidth;
		myHeight = document.documentElement.clientHeight;
	} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
		//IE 4 compatible
		myWidth = document.body.clientWidth;
		myHeight = document.body.clientHeight;
	}
	if( myWidth < 880 ) {
		showLayer( 'screen' );
	} else {
		hideLayer( 'screen' );
	}
	setTimeout( 'CheckWidth();', 100 );
}