// JavaScript Document

    function NewWindow(mypage,myname,w,h,scroll,pos)
    {

    if(pos=="random"){LeftPosition=(screen.availWidth)?Math.floor(Math.random()*(screen.availWidth-w)):50;TopPosition=(screen.availHeight)?Math.floor(Math.random()*((screen.availHeight-h)-75)):50;}
    if(pos=="center"){LeftPosition=(screen.availWidth)?(screen.availWidth-w)/2:50;TopPosition=(screen.availHeight)?(screen.availHeight-h)/2:50;}
    if(pos=="default"){LeftPosition=50;TopPosition=50}

    else if((pos!="center" && pos!="random" && pos!="default") || pos==null){LeftPosition=0;TopPosition=0}
      settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
      win=window.open(mypage,myname,settings);
    if(win.focus){win.focus();}}

    function CloseNewWin(){if(win!=null && win.open)win.close()}

    window.onfocus=CloseNewWin;

function menu_on(id) {
for(i=1;i<2;i++) {
	if(i!=id) {
		document.getElementById('menu'+String(i)).style.visibility="hidden";
		}
	}
	document.getElementById('menu'+String(id)).style.visibility="visible";
}

function menu_off(id) {
document.getElementById('menu'+String(id)).style.visibility="hidden";
}

function menu_off_all(id){
for(i=1;i<2;i++){
		if(i!=id) {
			document.getElementById('menu'+String(i)).style.visibility="hidden";
		}
	}
}

function kontrola(kosik) {
	var why = "";

 if(kosik.velikost.value == "0"){
	why += "Před vložením zadat velikost.\n";
	}
	if(kosik.barva.value == "0"){
	why += "Před vložením zadat barvu.\n";
	}
	if(kosik.mnozstvi.value == ""){
	why += "Před vložením zadat množství.\n";
	}

	if (why != ""){
		alert(why);
		kosik.mnozstvi.focus();
		return false;
	}
	else{
		return true;
	}
}