// JavaScript Document


  function check_form() {
    var country=document.getElementById('country');
    var zip=document.getElementById('zip_code');
    var cur=document.getElementById('currency');
    var email=document.getElementById('email');
    
    var reg_email = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;


    if(country.value=='') {
      alert('Zeme je povinný údaj');
      country.focus();
      return false;
    }
    
    if(zip.value=='') {
      alert('PSC je povinný údaj');
      zip.focus();
      return false;
    }
    
    if(cur.value=='') {
      alert('Mena je povinný údaj');
      cur.focus();
      return false;
    }
    
    
    if(reg_email.test(email.value)==false) {
      alert('Zadaný email nemá správný formát');
   
      email.focus();
      return false;
    }
    
    return true;
  }


	function showImage(im) {
		
		var thumbImage = document.getElementById(im);
		var detailImage = document.getElementById("detailFoto");
		var divDetailImage = document.getElementById("Fotodiv");
		var prevImage = document.getElementById("prevImage");
		var nextImage = document.getElementById("nextImage");
		var titleImage = document.getElementById("image_title");
		
		detailImage.src = thumbImage.src + "";
		
		var actual_pic = new String(im);
		var split_val = actual_pic.split("_")
		var prev_im = document.getElementById("foto_" + (split_val[1] - 1));
		var next_im = document.getElementById("foto_" + (eval(split_val[1] + " + " + 1)));
		
		titleImage.value = "Foto č. " + split_val[1] + ": " + thumbImage.title;
		
		if(prev_im) {
			prevImage.onclick = function() { showImage("foto_" + (split_val[1] - 1) ) };
			prevImage.style.visibility = "visible";
			prevImage.title = "Předchozí ­ foto: " + prev_im.title;
		} else {
			prevImage.style.visibility = "hidden";	
		}
		
		if(next_im) {
			nextImage.onclick = function() { showImage("foto_" + ( eval(split_val[1] + " + " + 1) ) ) };
			nextImage.style.visibility = "visible";
			nextImage.title = "Další­ foto: " + next_im.title;
		} else {
			nextImage.style.visibility = "hidden";			
		}
		
		titleImage.style.visibility = "visible";
		divDetailImage.style.visibility = "visible";
		
	}

	function closeImage(im) {
		
		document.getElementById("prevImage").style.visibility = "hidden";
		document.getElementById("nextImage").style.visibility = "hidden";
		document.getElementById("Fotodiv").style.visibility = "hidden";
		document.getElementById("image_title").style.visibility = "hidden";
		
	}