function ShowMenuImageElements( id ) {

	var sub 	= document.getElementById( id.substring(0,2)+"_sub" );
	var media	= document.getElementById( id+"_media" );
	
	if ( sub!=null ) sub.style.display = 'block';
	if ( media!=null ) media.style.display = 'block';	
}

function ShowHideMenuElement( obj ) {
	
	/*if ( obj.id.length==2 ) suffix = "_sub";
	else suffix = '_img';*/
	
	var suffix = obj.id.length==2 ? 'sub' : 'media';
	var ul     = document.getElementById( obj.id + "_" + suffix );
	var status = ul.style.display;
	
	if ( status=='' || status=='none') ul.style.display = 'block';	// show
	else ul.style.display = 'none';									// hide
	
}