var NS4 = (document.layers) ? 1 : 0;
var IE4 = (document.all) ? 1 : 0;
var ver4 = (NS4 || IE4) ? 1 : 0;
	
var trvale = false;
var zobrazenyHelpBox = '';
var timeID;
	
function vrstva(menuName, on, addX, addY) {
	if (on) {
		if (zobrazenyHelpBox != '' && zobrazenyHelpBox!=menuName) {
			skryjHelpBox();
		}
		
		
		if (NS4) {
			document.layers[menuName].visibility = "show";				
		} else {
			document.all[menuName].style.visibility = "visible";
			//document.all[menuName].style.left = event.x + addX;
			//document.all[menuName].style.top = event.y + addY;
		}
	} 
	else {
		zobrazTrvale(menuName);
	}

}

function skryjHelpBox() {
	//trvale = false;
	try {
		clearTimeout(timeID);
		if (NS4) {
			document.layers[zobrazenyHelpBox].visibility = "hide";
		} else {
			document.all[zobrazenyHelpBox].style.visibility = "hidden";
		}
	}catch(e){};
	zobrazenyHelpBox = '';
}	

// funkce zajistujici trvale zobrazeni napovedy (na 2s)
function zobrazTrvale(menuName) {		

		if (zobrazenyHelpBox != '')
			skryjHelpBox();
			
		zobrazenyHelpBox = menuName + '';
		timeID = setTimeout('skryjHelpBox()', 1000);
		if (NS4) {
			document.layers[menuName].visibility = "show";
		} else {
			document.all[menuName].style.visibility = "visible";
		}
}


function showHelp(type, options) {
	window.open('help.aspx?type=' + type, 'help', options);
}