var active_item;

function show_menu ( link_id, submenu_id ) {
	
	var link = $( link_id );
	var submenu = $( submenu_id );
	
	if( link && submenu ) {
	
		submenu.style.display='block';
		if ( link_id != active_item ) {
			link.className='link_1 ov';
		} else {
			link.className='link_1 ov active';
		}
	}
}

function hide_menu ( link_id, submenu_id ) {
	
	var link = $( link_id );
	var submenu = $( submenu_id );
	
	if( link && submenu ) {
	
		submenu.style.display='none';
		if ( link_id != active_item ) {
			link.className='link_1';
		} else {
			link.className='link_1 ov active';
		}
	}
}

function over( id ) {
	var i_s = $( id ).src.split('.');
	var f = i_s.length-2;
	var regex = /_ov$/;

	if( i_s[f].match( regex ) ) {
		i_s[f] = i_s[f].replace( regex, '' );
	} else {
		i_s[f] = i_s[f] + '_ov';
	}
	
	var n_i_s = i_s.join( '.' );
	
	try {
		$( id ).src = n_i_s;
	} catch( error ) {
		// Error
	}
}