function zobrazSkryj(idecko, display)
{	el=document.getElementById(idecko).style;
	if ( display == 0) {
		el.display = 'none';
	 	el.display = 'hidden';
	} else if ( display == 1) {
		el.display = 'block';
	 	el.display = 'visible';
	} else {
		el.display=(el.display == 'block')?'none':'block';
		el.display=(el.visibility == 'visible')?'hidden':'visible';
	} 
}