function textField(id){
	document.getElementById(id).value='';
}
function AddFavorite(linkObj,addUrl,addTitle) 
{ 
  if (document.all && !window.opera) 
  { 
    window.external.AddFavorite(addUrl,addTitle); 
    return false; 
  } 
  else if (window.opera && window.print) 
  { 
    linkObj.title = addTitle; 
    return true; 
  } 
  else if ((typeof window.sidebar == 'object') && (typeof window.sidebar.addPanel == 'function')) 
  { 
    if (window.confirm('Přidat oblíbenou stránku jako nový panel?')) 
    { 
      window.sidebar.addPanel(addTitle,addUrl,''); 
      return false; 
    } 
  } 
  window.alert('Po potvrzení stiskněte CTRL-D,\nstránka bude přidána k vašim oblíbeným odkazům.'); 
  return false; 
}
function vzor(hodnota){
	document.getElementById('vzor'+hodnota).selected=1;
}

function leftPosition(obj,ev){
	if (ev) {
		if ( obj.offsetLeft + ((obj==document.body) ? 0 : leftPosition(obj.offsetParent)) < ev.clientX )  {
			return obj.offsetLeft + ((obj==document.body) ? 0 : leftPosition(obj.offsetParent))
		} else { 
			return ( ev.clientX );
		}
	} else { 
		return obj.offsetLeft + ((obj==document.body) ? 0 : leftPosition(obj.offsetParent));
	}
}
function topPosition(ev) {
	 return ( ev.clientY + topScroll() );
}
function hoverimage_init(obj, objEvent, photoURL){
	obj.photoURL = photoURL;
	obj.onmouseover = hoverimage_show;
	obj.onmousemove = hoverimage_move;
	obj.onmouseout = hoverimage_hide;
	obj.onmouseover(objEvent);
}
function hoverimage_show (ev) {
	if (window.event) {ev = window.event}
	var tt = document.getElementById("hoverimage");

	tt.innerHTML = "<span id='hoverimage_alt'>načítám foto...</span><img id='hoverimage_img' src='" + this.photoURL + "' onload='hoverimage_hidealt();' />";
	hoverimage_position (ev,this);
}
function hoverimage_position (ev,obj) {
	var tt = document.getElementById("hoverimage");
	tt.style.left = leftPosition(obj,ev) + 5 + "px";

	var posTop = topPosition(ev) + 15 + "px"; 
	if ((topPosition(ev) + tt.offsetHeight + 15) > (document.documentElement.clientHeight + topScroll()) ) posTop = topPosition(ev) - tt.offsetHeight - 10 + "px"; //nezmizne nam to nahodou za dolni okraj?
	tt.style.top = posTop;
	tt.style.display = "block";
}
function hoverimage_hide (ev) {
	if (window.event) {ev = window.event};
	var tt = document.getElementById("hoverimage");
	tt.style.display = "none";
}
function hoverimage_move (ev) {
	if (window.event) {ev = window.event};
	hoverimage_position (ev,this);
}
function hoverimage_hidealt() {
	document.getElementById("hoverimage_alt").style.display="none";
	document.getElementById("hoverimage_img").style.display="inline";
}
function topScroll() {
	if (window.innerHeight) {
		  return ( window.pageYOffset )
	} else if (document.documentElement && document.documentElement.scrollTop) {
		return ( document.documentElement.scrollTop )
	} else if (document.body) {
		  return ( document.body.scrollTop )
	}
}
function showVariants(point){
	//alert(point);
	
	point.parentNode.getElementsByTagName('DIV')[0].style.display='block';
}