function get_cookie ( cookie_name )
{
  var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}


function checkIntroScreen(imgname, root_position)
{
var introscreen = get_cookie ('introscreen');
if (introscreen==null || introscreen!="disable")
  {
  show(imgname, root_position);
  document.cookie="introscreen=disable";
  }
}

function show(imgname, root_position) {
	// detekcia rozmeru img
	var newImg = new Image();
	imgnamex=root_position+'userfiles/'+imgname;
	newImg.src = imgnamex;
	var winheight = newImg.height;
	var winwidth = newImg.width;
	// nastavenie okna
	var scrollY;
	scrollY =  document.documentElement.scrollTop;	
	if(scrollY==0)	scrollY = window.document.body.scrollTop;
	poloha_left=(self.screen.width-winwidth)/2;
	poloha_top=scrollY;
	document.getElementById('detailwin').style.display = 'block';
	document.getElementById('detailwin').style.width = winwidth+'px';
	document.getElementById('detailwin').style.height = winheight+'px';
	document.getElementById('detailwin').style.backgroundImage = 'url('+root_position+'userfiles/'+imgname+')';
	document.getElementById('detailwin').style.left = poloha_left+'px';
	document.getElementById('detailwin').style.top = 100+poloha_top+'px';

}

	function hide() {
	document.getElementById('detailwin').style.display = 'none';  
}

textshow=false;

function showtext(obj_id) {	
	document.getElementById(obj_id).style.display = 'block';
	textshow=true; 
}

function hidetext(obj_id) {	
	document.getElementById(obj_id).style.display = 'none';
	textshow=false; 
}

function ShowHideText(obj_id){
	if (textshow) hidetext(obj_id)
   else showtext(obj_id)
	}

function ShowProduktDetail(id, root_position) {
		HideProduktDetail();
		document.getElementById(id).style.display = 'block';
	}
	
function HideProduktDetail(){
	document.getElementById('p15').style.display = 'none';
	document.getElementById('p23').style.display = 'none';
	document.getElementById('p100').style.display = 'none';
	}
	
function ShowMenuItem(itemID){
		id="item"+itemID;
		document.getElementById(id).style.display = 'block';
	}
	
	function HideMenuItem(itemID){
		id="item"+itemID;
		document.getElementById(id).style.display='none';
	}	
	
function kontrola_user_rec() 
{ 
	var poslat=false;
	var meno = document.user_rec.meno.value; 
	var text = document.user_rec.text.value;
	if(meno=="") alert('Nevyplnili ste políčko Meno.');
	else if(text=="") alert('Nevyplnili ste políčko Text hodnotenia.');
	else poslat=true; 
	return poslat; 
}