var popupMenu = {

	divName : 'popup-menu-',
	divCurrent : 0,

	set : function( divNumber,offNumber ) {

		var nn4 = (document.layers);
		var nn6 = (document.getElementById && !document.all);
		var ie4 = (document.all && !document.getElementById);
		var ie5 = (document.all && document.getElementById);

		if( popupMenu.divCurrent != 0 ) {
			var divHide = popupMenu.divName + popupMenu.divCurrent;
			if (nn4) { if( document.layers[divHide] ) { document.layers[divHide].display = 'none'; }}
			else if (nn6 || ie5) { if( document.getElementById(divHide) ) { document.getElementById(divHide).style.display = 'none'; }}
			else if (ie4) { if( document.all(divHide) ) { document.all(divHide).style.display = 'none'; }}
		}

		if( divNumber != 0 ) {
			var divShow = popupMenu.divName + divNumber;
			if (nn4) { if( document.layers[divShow] ) { document.layers[divShow].display = 'block'; }}
			else if (nn6 || ie5) { if( document.getElementById(divShow) ) { document.getElementById(divShow).style.display = 'block'; }}
			else if (ie4) { if( document.all(divShow) ) { document.all(divShow).style.display = 'block'; }}

			if( document.getElementById('m'+divNumber) ) {
				document.getElementById('m'+divNumber).className = 'active';   //vysviceni hlavni polozky (jakoby hover)
			}
		}
		else {
			if( document.getElementById('m'+offNumber) ) {
				document.getElementById('m'+offNumber).className = '';
			}
		}

		popupMenu.divCurrent = divNumber;
	}
}