function fit_window(){
  pictureWidth = objGet('pic').width;
  pictureHeight = objGet('pic').height;
  window.resizeTo(pictureWidth+60, pictureHeight+96);  
}

function change_price(sel){
  if(prices.length > 1){
    var index = sel.selectedIndex;
    objGet('price').value=prices[index];
  }
}

function check_payment(){
  f=objGet('order_form');
  if(f.payment.value=="dobírkou"){
    if(f.country.value==12 && f.country.value==48) return true;
    else{
      alert("Platba dobírkou je možná pouze pro české a rakouské zákazníky.");
      return false;
    }
  }
  else return true;  
}

function validate_order(){
  f=objGet('order_form');
  if(regUser==true){
    if(objGet('agreement').checked==true)
      objGet('submit').disabled=false;
    else
      objGet('submit').disabled=true;
  }
  else{
    if(objGet('address_match').checked==true){
      f.s_address.value=f.address.value; objGet('s_address').readOnly=true;
      f.s_city.value=f.city.value; objGet('s_city').readOnly=true;
      f.s_post_code.value=f.post_code.value; objGet('s_post_code').readOnly=true;
    }
    else{
      objGet('s_address').readOnly=false;
      objGet('s_city').readOnly=false;
      objGet('s_post_code').readOnly=false;
    }
  
    if(f.name.value=="" || f.surname.value=="" || f.address.value=="" 
    || f.city.value=="" || f.post_code.value==""
    || wrong_mail_address(f.email.value) || f.phone.value==""  || objGet('agreement').checked==false
    || ( !objGet('address_match').checked && ( f.s_address.value=="" 
    || f.s_city.value=="" || f.s_post_code.value=="" ))
    ) objGet('submit').disabled=true;
    else objGet('submit').disabled=false;
  } 
  
}

function wrong_mail_address(adresa){
  var error=false;
  var pozice_zavinace = adresa.indexOf("@");
    if (pozice_zavinace < 0)
        error=true;
    var cast_pred_zavinacem = adresa.substring(0,pozice_zavinace);
    var cast_po_zavinaci = adresa.substring(pozice_zavinace+1,adresa.length);
    if (cast_po_zavinaci.indexOf("@") >= 0)
        error=true;
    if (cast_pred_zavinacem.length <= 0)
        error=true;
    if (cast_po_zavinaci.length <= 0)
        error=true;

    return error;
}

function objGet(id){
   if(Boolean(document.getElementById))
      return document.getElementById(id);
   else if(Boolean(document.all))
      return eval('document.all.'+id);
   else
      return eval('document.'+id);
}

function switchImg(url){
  objGet('main-pic').src=url;
}

function openImage(file){
  url = '/shop/photo.php?file='+escape(file);
  win = window.open(url, 'image', 'resizable=1,top=20,left=20,menubar=0,scrollbars=1,width=' + 300 + ',height=' + 220 );
  win.focus();
}

function clearPassword(){
  x=objGet('login_form');
  if(x.password.value=='.......') x.password.value='';
}

function clearEmail(){
  x=objGet('login_form');
  if(x.login.value=='Vložte e-mail...') x.login.value='';
}

function clearNewsletter(){
  x=objGet('newsletter-box');
  if(x.value=='Vložte Váš e-mail...') x.value='';
}

function clearkeywords(){
  x=objGet('search');
  if(x.keywords.value=='Zadejte klíčová slova...') x.keywords.value='';
}

function validateReg(edit){
  form=objGet('reg_form');
 
    if(form.name.value=="" || form.surname.value==""
       || form.address.value=="" || form.city.value==""
       || form.post_code.value==""  || form.phone.value==""
       || wrong_mail_address(form.email.value) || (form.password.value=="" && !edit)) 
      objGet('submit').disabled=true;
      
    else objGet('submit').disabled=false;
}