// clear <input> text box
function clearDefault(srch) {
  if (srch.defaultValue==srch.value) srch.value = ""
}

// find object
function findObj(n, d) {
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

// switch layers
function switchLayers() {
  var i,p,v,obj,args=switchLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=obj.display; v=(v=='none')?'block':(v=='block')?'none':v; }
    obj.display=v; }
}

// show/hide layers
function showHideLayers() {
  var i,p,v,obj,args=showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}

// preload images
function preload(){
plus=new Image();
minus=new Image();
plus.src="../_imgs/plus.gif";
minus.src="../_imgs/minus.gif";
}

// togle images
function toggle(img){
obj = findObj(img);
if (obj.src==plus.src) obj.src=minus.src;
else obj.src=plus.src
}

// popup picture in public section
function PopupPic(sPicURL, params) {
      window.open( "popup.php?"+sPicURL+"&"+escape(params), "", "resizable=1,HEIGHT=200,WIDTH=200");
}

// popup picture in admin section
function AdminPopupPic(sPicURL, params) {
      window.open( "../cs/popup.php?"+sPicURL+"&"+escape(params), "", "resizable=1,HEIGHT=200,WIDTH=200");
}

// add link to favorites
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; 
} 

// go to URL selected it SELECT BOX
function goToURL(targ,selObj,restore){
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

// confirm link redirection
function confirmLink(theLink, theQuery)
{
    var is_confirmed = confirm(theQuery);
    return is_confirmed;
}

// check value going to basket and submit form
function check_pieces (id, alertMessage) {
	if (document.formProdukty['kusu'+id].value > 0){
		document.formProdukty.doKosiku.value = id;
		document.formProdukty.submit();
	}
	else
		alert(alertMessage);
}

// validate email format
function ValidateEmail(theinput)
{
	s=theinput.value
	if(s.search)
	{
		return (s.search(new RegExp("^([-!#$%&'*+./0-9=?A-Z^_`a-z{|}~])+@([-!#$%&'*+/0-9=?A-Z^_`a-z{|}~]+\.)+[a-zA-Z]{2,4}$","gi"))>=0)
	}
	if(s.indexOf)
	{
		at_character=s.indexOf('@')
		if(at_character<=0 || at_character+4>s.length)
			return false
	}
	if(s.length<6)
		return false
	else
		return true
}