function get( id ){
	return document.getElementById( id );
}
function chser( fid ){
	var ar = new Array();
	ar[0] = 'serwery';
	ar[1] = 'serwery_seo';

	for( var i=0;i<ar.length;i++ ){
		var iid = ar[i];
		document.getElementById( iid ).style.display = 'none';
		document.getElementById( 'marr_'+iid ).style.display = 'none';
		document.getElementById( 'mbutt_'+iid ).className = '';
	}
	document.getElementById( fid ).style.display = 'block';
	document.getElementById( 'marr_'+fid ).style.display = 'block';
	document.getElementById( 'mbutt_'+fid ).className = 'active';
}