function showhide_element( element_name, state )
{
	if( document.getElementById ) 
	{ 
		// DOM3 = IE5, NS6 
		document.getElementById(element_name).style.display = state; 
	} 
	else 
	{ 
		if (document.layers) 
		{ 
			// Netscape 4 
			document.layers[element_name].display = state; 
		} 
		else 
		{ 
			// IE 4 
			document.all.element_name.style.display = state; 
		} 
	}
} 

function show_directions()
{
	showhide_element( "directions_msg_show", "none" );
	showhide_element( "directions", "inline" );
	showhide_element( "directions_msg_hide", "inline" );
}

function hide_directions()
{
	showhide_element( "directions", "none" );
	showhide_element( "directions_msg_hide", "none" );
	showhide_element( "directions_msg_show", "inline" );
}

function show_studio_video()
{
	showhide_element( "studio_video_show", "none" );
	showhide_element( "studio_video", "inline" );
	showhide_element( "studio_video_hide", "inline" );
}

function hide_studio_video()
{
	showhide_element( "studio_video", "none" );
	showhide_element( "studio_video_hide", "none" );
	showhide_element( "studio_video_show", "inline" );
}

function show_sketch_map()
{
	showhide_element( "sketch_show", "none" );
	showhide_element( "sketch_map", "inline" );
	showhide_element( "sketch_hide", "inline" );
}

function hide_sketch_map()
{
	showhide_element( "sketch_map", "none" );
	showhide_element( "sketch_hide", "none" );
	showhide_element( "sketch_show", "inline" );
}

function show_map()
{
	showhide_element( "map_show", "none" );
	showhide_element( "map", "inline" );
	showhide_element( "map_hide", "inline" );
}

function hide_map()
{
	showhide_element( "map", "none" );
	showhide_element( "map_hide", "none" );
	showhide_element( "map_show", "inline" );
}

function changeSrcOfImage(id, img)
{
	document.getElementById(id).setAttribute('src', img) ;
	
	return false;
}