function displayUpstreamHint() {

	if ( !document.getElementById ) {
		return;
	}

	var objElement	=	document.getElementById( 'layout_start_teaser' );

	if ( objElement ) {
		objElement.style.display	=	'block';
	}

}


function hideUpstreamHint() {

	if ( !document.getElementById ) {
		return;
	}

	var objElement	=	document.getElementById( 'layout_start_teaser' );

	if ( objElement ) {
		objElement.style.display	=	'none';
	}

}


function switchReferenceImage( idElement, urlImage ) {

	if ( !document.getElementById ) {
		return;
	}

	var objElement	=	document.getElementById( idElement );

	if ( objElement  &&  urlImage != '' ) {
		objElement.src	=	urlImage;
	}

}