function isIE() {
   return (document.all && navigator.userProfile && !isOpera()
           && navigator.appName == 'Microsoft Internet Explorer') ?
           true : false;
}

function isOpera() {
   return (window.opera) ? true : false;
}

//******************************************************************//
//funkce specificke pro e-shop, validacni, ruzne dialogy atd. jinde nepouzitelne
//******************************************************************//

// vybral vsechny parametry?
function insertCart(form) {
   var sels = form.getElementsByTagName('SELECT');
   for (var i = 0, el; el = sels[i]; i++) {
      if (el.className.indexOf('cart-param') > -1) {
         if (el.value == 0) {
            alert(js_text["cart_params"]);   
            return false;
         }
      }
   }
   return true;
}

// cena nakupu vcetne dodani
function countDeliveryPrice(price, price_cart, mena, id) {
   var el_del = document.getElementById('delivery_price');
   var el_total = document.getElementById('total_price');
   if (price > -1) {
      el_del.innerHTML = priceFormat(price) + ' ' + mena;
      el_total.innerHTML = Math.round(price + price_cart) + ',- ' + mena;
   }
   else {
      el_del.innerHTML = js_text["cart_deliver1"];
      el_total.innerHTML = price_cart + ',- ' + mena + '  + ' + js_text["cart_deliver2"];         
   }
   // mozne platby
   disablePayments(payments[id]);
}

// vybral nejake dodani?
function testDeliver() {
   var table1, table2;
   var deliver = false, payment = false;
   if (table1 = getEl('delivers_table')) {  
      var inputs = table1.getElementsByTagName('INPUT');
      for (var i = 0, el; el = inputs[i]; i++) {      
         if (el.checked) deliver = true;
      }
   }
   if (table2 = getEl('payments_table')) {  
      var inputs = table2.getElementsByTagName('INPUT');
      for (var i = 0, el; el = inputs[i]; i++) {      
         if (el.checked) payment = true;
      }
   }
   if (!deliver || !payment) {
      alert(js_text["cart_deliver"]);
      return false;   
   }
   return true;
}

// disable vsechny metody platby
function disablePayments(show) {
   if (!show) show = [];
   var table;
   if (table = getEl('payments_table')) {  
      var inputs = table.getElementsByTagName('INPUT');
      for (var i = 0, el; el = inputs[i]; i++) {      
         el.disabled = !inArr(show, el.value);
         el.checked = (el.disabled) ? false : el.checked;
      }
   }
}

function inArr(arr, search) {
   for(var i = 0, y; y = arr[i]; i++) {
      if (y == search) return true;
   }
   return false;
}

function priceFormat(num) {
   
   if (num == 0) {
      return '0';
   }
   
   num = num.toString();
   
   if (num.indexOf('.') == 0) {
      num += ',00';
   }
   else if (num.indexOf('.') == num.length -2) {
      num += '0';   
      num = num.replace('.', ',');
   }
   return num;
}

//test vyplneni udaju v login formu
function validate_login_form(form) {
   if(form.login.value=="") {
      alert(js_text["login_no_login"]);
      return false;
   }
   else if(form.password.value=="") {
      alert(js_text["login_no_password"]);
      return false;
   }
   else {
      return true;
   }
}

// test vyplneni udaju ve forget formulari
function validate_forget_form(form) {
   if(form.forget.value == "") {
      alert(js_text["forget_no_login"]);
      return false;
   }
   return true;
}

//test spravneho poctu pri vkladani do kosiku
function validate_count(form) {
   if(form.insert_count.value<1 || form.insert_count.value>10000 || isNaN(form.insert_count.value) || form.insert_count.value.indexOf(".")==1) {
      alert(js_text["buy_bad_number"]);
      return false;
   }
   return true;
}

//test editace poctu v kosiku	
function validate_edit_count(form) {
   if(form.edit_count.value<1 || isNaN(form.edit_count.value) || form.edit_count.value.indexOf(".")==1) {
      alert(js_text["buy_bad_number"]);
      return false;
   }
   return true;
}

//test vyhledavaciho formulare	
function validate_search(form) {
   if(form.key_words.value=='' || form.key_words.value.length<2) {
      alert(js_text["search_bad_keyword"]);
      return false;
   }
   return true;
}



//zobrazeni a skryti vyhledavaciho formulare
function switch_adv_form(id) {
	var adv_form = document.getElementById(id);
	if(adv_form.style.display == "none") {
		adv_form.style.display = "block";
	}
	else {
		adv_form.style.display = "none";
	}
}

//zobrazeni a skryti napovedy u vyhledavaciho formulare
function switch_help(id) {
	var help = document.getElementById(id);
	if(help.style.display == "block") {
		help.style.display = "none";
	}
	else {
		help.style.display = "block";    	 
	}   
}

//test vstupnich dat v pokrocilem vyhledavani	
function validate_adv_search(form) {
	if(form.key_words.value=='' || form.key_words.value.length<2) {
		alert(js_text["search_bad_keyword"]);
		return false;
	}
	else if (
      form.item_name.checked == false && 
      form.short_text.checked == false && 
      form.long_text.checked == false && 
      form.code.checked == false && 
      form.redaction.checked == false && 
      form.news.checked == false )
   {
		alert(js_text["search_no_attr"]);
		return false;
	}
	return true;
}	

//potvrzeni objednavky	
function order_confirmation() {
   // zkontroluj zda je vybran zpusob dodani
   /*deliver_type_selected = false;
   es = document.getElementsByName("deliver_type");
   for(i=0; i<es.length; i++) {
      deliver_type_selected |= es[i].checked;
      if(es[i].checked) {
         return eshop_show_deliver_warning(es[i].value);
      }
   }
   // pokud zpusob dodani neni zadan, vrat se
   if(!deliver_type_selected) {
      alert(js_text["buy_choose_deliver"]);
      return false;
   }*/
   // potvrzeni objednavky
	return window.confirm(js_text["buy_order_confirm"]);
}

//potvrzeni vymazu z kosiku
function delete_confirm_cart() {
   logic = window.confirm(js_text["buy_delete_confirm"]);
   return logic;
}

//MD5 pro logovaci formulare

function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF)
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
  return (msw << 16) | (lsw & 0xFFFF)
}

function rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt))
}

function cmn(q, a, b, x, s, t)
{
  return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}
function ff(a, b, c, d, x, s, t)
{
  return cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
function gg(a, b, c, d, x, s, t)
{
  return cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
function hh(a, b, c, d, x, s, t)
{
  return cmn(b ^ c ^ d, a, b, x, s, t)
}
function ii(a, b, c, d, x, s, t)
{
  return cmn(c ^ (b | (~d)), a, b, x, s, t)
}

function coreMD5(x)
{
  var a =  1732584193
  var b = -271733879
  var c = -1732584194
  var d =  271733878

  for(i = 0; i < x.length; i += 16)
  {
    var olda = a
    var oldb = b
    var oldc = c
    var oldd = d

    a = ff(a, b, c, d, x[i+ 0], 7 , -680876936)
    d = ff(d, a, b, c, x[i+ 1], 12, -389564586)
    c = ff(c, d, a, b, x[i+ 2], 17,  606105819)
    b = ff(b, c, d, a, x[i+ 3], 22, -1044525330)
    a = ff(a, b, c, d, x[i+ 4], 7 , -176418897)
    d = ff(d, a, b, c, x[i+ 5], 12,  1200080426)
    c = ff(c, d, a, b, x[i+ 6], 17, -1473231341)
    b = ff(b, c, d, a, x[i+ 7], 22, -45705983)
    a = ff(a, b, c, d, x[i+ 8], 7 ,  1770035416)
    d = ff(d, a, b, c, x[i+ 9], 12, -1958414417)
    c = ff(c, d, a, b, x[i+10], 17, -42063)
    b = ff(b, c, d, a, x[i+11], 22, -1990404162)
    a = ff(a, b, c, d, x[i+12], 7 ,  1804603682)
    d = ff(d, a, b, c, x[i+13], 12, -40341101)
    c = ff(c, d, a, b, x[i+14], 17, -1502002290)
    b = ff(b, c, d, a, x[i+15], 22,  1236535329)

    a = gg(a, b, c, d, x[i+ 1], 5 , -165796510)
    d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632)
    c = gg(c, d, a, b, x[i+11], 14,  643717713)
    b = gg(b, c, d, a, x[i+ 0], 20, -373897302)
    a = gg(a, b, c, d, x[i+ 5], 5 , -701558691)
    d = gg(d, a, b, c, x[i+10], 9 ,  38016083)
    c = gg(c, d, a, b, x[i+15], 14, -660478335)
    b = gg(b, c, d, a, x[i+ 4], 20, -405537848)
    a = gg(a, b, c, d, x[i+ 9], 5 ,  568446438)
    d = gg(d, a, b, c, x[i+14], 9 , -1019803690)
    c = gg(c, d, a, b, x[i+ 3], 14, -187363961)
    b = gg(b, c, d, a, x[i+ 8], 20,  1163531501)
    a = gg(a, b, c, d, x[i+13], 5 , -1444681467)
    d = gg(d, a, b, c, x[i+ 2], 9 , -51403784)
    c = gg(c, d, a, b, x[i+ 7], 14,  1735328473)
    b = gg(b, c, d, a, x[i+12], 20, -1926607734)

    a = hh(a, b, c, d, x[i+ 5], 4 , -378558)
    d = hh(d, a, b, c, x[i+ 8], 11, -2022574463)
    c = hh(c, d, a, b, x[i+11], 16,  1839030562)
    b = hh(b, c, d, a, x[i+14], 23, -35309556)
    a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060)
    d = hh(d, a, b, c, x[i+ 4], 11,  1272893353)
    c = hh(c, d, a, b, x[i+ 7], 16, -155497632)
    b = hh(b, c, d, a, x[i+10], 23, -1094730640)
    a = hh(a, b, c, d, x[i+13], 4 ,  681279174)
    d = hh(d, a, b, c, x[i+ 0], 11, -358537222)
    c = hh(c, d, a, b, x[i+ 3], 16, -722521979)
    b = hh(b, c, d, a, x[i+ 6], 23,  76029189)
    a = hh(a, b, c, d, x[i+ 9], 4 , -640364487)
    d = hh(d, a, b, c, x[i+12], 11, -421815835)
    c = hh(c, d, a, b, x[i+15], 16,  530742520)
    b = hh(b, c, d, a, x[i+ 2], 23, -995338651)

    a = ii(a, b, c, d, x[i+ 0], 6 , -198630844)
    d = ii(d, a, b, c, x[i+ 7], 10,  1126891415)
    c = ii(c, d, a, b, x[i+14], 15, -1416354905)
    b = ii(b, c, d, a, x[i+ 5], 21, -57434055)
    a = ii(a, b, c, d, x[i+12], 6 ,  1700485571)
    d = ii(d, a, b, c, x[i+ 3], 10, -1894986606)
    c = ii(c, d, a, b, x[i+10], 15, -1051523)
    b = ii(b, c, d, a, x[i+ 1], 21, -2054922799)
    a = ii(a, b, c, d, x[i+ 8], 6 ,  1873313359)
    d = ii(d, a, b, c, x[i+15], 10, -30611744)
    c = ii(c, d, a, b, x[i+ 6], 15, -1560198380)
    b = ii(b, c, d, a, x[i+13], 21,  1309151649)
    a = ii(a, b, c, d, x[i+ 4], 6 , -145523070)
    d = ii(d, a, b, c, x[i+11], 10, -1120210379)
    c = ii(c, d, a, b, x[i+ 2], 15,  718787259)
    b = ii(b, c, d, a, x[i+ 9], 21, -343485551)

    a = safe_add(a, olda)
    b = safe_add(b, oldb)
    c = safe_add(c, oldc)
    d = safe_add(d, oldd)
  }
  return [a, b, c, d]
}

function binl2hex(binarray)
{
  var hex_tab = "0123456789abcdef"
  var str = ""
  for(var i = 0; i < binarray.length * 4; i++)
  {
    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8)) & 0xF)
  }
  return str
}

function binl2b64(binarray)
{
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
  var str = ""
  for(var i = 0; i < binarray.length * 4; i += 3)
  {
    x = binarray[i>>2]
    alert(binarray[i>>5+1])
    str += tab.charAt(((binarray[i>>5] << (i%32)) & 0x3F) |
                      ((binarray[i>>5+1] >> (32-i%32)) & 0x3F))
  }
  return str
}

function binb2b64(binarray)
{
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
  var str = ""
  for(var i = 0; i < binarray.length * 32; i += 6)
  {
    alert(binarray[i>>5+1])
    str += tab.charAt(((binarray[i>>5] << (i%32)) & 0x3F) |
                      ((binarray[i>>5+1] >> (32-i%32)) & 0x3F))
  }

  return str
}

function str2binl(str)
{
  var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks
  var blks = new Array(nblk * 16)
  for(var i = 0; i < nblk * 16; i++) blks[i] = 0
  for(var i = 0; i < str.length; i++)
    blks[i>>2] |= (str.charCodeAt(i) & 0xFF) << ((i%4) * 8)
  blks[i>>2] |= 0x80 << ((i%4) * 8)
  blks[nblk*16-2] = str.length * 8
  return blks
}

function strw2binl(str)
{
  var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks
  var blks = new Array(nblk * 16)
  for(var i = 0; i < nblk * 16; i++) blks[i] = 0
  for(var i = 0; i < str.length; i++)
    blks[i>>1] |= str.charCodeAt(i) << ((i%2) * 16)
  blks[i>>1] |= 0x80 << ((i%2) * 16)
  blks[nblk*16-2] = str.length * 16
  return blks
}

function hexMD5 (str) { return binl2hex(coreMD5( str2binl(str))) }
function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) }
function b64MD5 (str) { return binl2b64(coreMD5( str2binl(str))) }
function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) }
function calcMD5(str) { return binl2hex(coreMD5( str2binl(str))) }