N   = (document.layers) ? true:false;                 // netscape 4
	IE   = (document.all) ? true:false;                    // ie4+
	DOM = ((document.getElementById)&&(!IE))?true:false;   // ns6 etc.
	
	function popUp(menuName,on) {
	   if (on) {
	      /* DD moveLayers(menuName); */
	      if (IE) {document.all[menuName].style.visibility = "visible";}
	      if (N) {document[menuName].visibility = "visible";}
	      if (DOM) {document.getElementById(menuName).style.visibility = "visible";}
	   } else {
	      if (IE) {document.all[menuName].style.visibility = "hidden";}
	      if (N) {document[menuName].visibility = "hidden";}
	      if (DOM) {document.getElementById(menuName).style.visibility = "hidden";}
	   }
	} 
	
	// to je jen kvuli te skurvene godzile OPERE - bo nedokresluje pozadi na hover
	function tdcc(tdName,on) {
	   if (on) {
	      /* DD moveLayers(menuName); */
	      if (IE) {document.all[tdName].style.background = "#3C8DD4";}
	      if (N) {document[tdName].background = "#3C8DD4";}
	      if (DOM) {document.getElementById(tdName).style.background = "#3C8DD4";}

	   } else {
	      if (IE) {document.all[tdName].style.background = "#EAEAE8";}
	      if (N) {document[tdName].background = "#EAEAE8";}
	      if (DOM) {document.getElementById(tdName).style.background = "#EAEAE8";}
	   }
	}