function ukazBlok(blok){
			
			div = document.getElementById(blok);
			
			if (div.style.visibility == "visible"){
				div.style.visibility = "hidden";
				div.style.position = "absolute";
			}
			else
			{
				div.style.visibility = "visible";
				div.style.position = "static";
			};
		};
		
function showImage(url, width, height)
{
	window.open(url,'_blank', 'toolbar=no,menubar=no,location=no,directories=no, scrollbars=no,resizable=yes,status=no,width=' + (width +20) +',height=' + (height + 20) );	
};