function changeLangSelect(lang) {
  var possible = document.getElementsByTagName('span');
  for (var i in possible) {
    if (possible[i].className = 'selects') { 
      if (possible[i].id == lang + '_select') {
        possible[i].style.display = 'block';
      } else {
        possible[i].style.display = 'none';
      }
    }
  }
}

function changeSelect(id,lang) {
  var ids = ['pages','products','news'];
  var module_id = 0;
  for(i=0;i<ids.length;i++){
    if (id == ids[i]) {
      document.getElementById(lang+'_'+ids[i]).style.display = 'inline';
    } else {
      document.getElementById(lang+'_'+ids[i]).style.display = 'none';
    }    
  }
  if (id == 'pages') {
    module_id = 0; 
  } else if (id == 'products') {
    module_id = 1;
  } else if (id == 'news') {
    module_id = 2;
  }
  document.getElementById('module_id').value = module_id;
}

function changeLang(lang) {
  var possible = document.getElementsByTagName('span');
  for (var i in possible) {
    if (possible[i].className == 'languageSelect') {
      if (possible[i].id == lang) {
        possible[i].style.display = 'block';
      } else {
        possible[i].style.display = 'none';
      }
    }
  }
}

function elementOnClick(arg) {
  return document.getElementById(arg).style.display == 'block' ?
    document.getElementById(arg).style.display='none' :
    document.getElementById(arg).style.display='block';
}

function trim(arg) {
  return(arg||"").replace(/^\s+|\s+$/g,"");
}

function validateForm(borders, ids, labels, message, formName) {
  var error = '';
  var dtimeRegex = new RegExp("^([0-9]{4})-([0-9]{2})-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}$");
  var emailRegex = new RegExp("^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$");
  var phoneRegex = new RegExp("^[0-9\+]+$");
  var antispamAn = '4';
  if (message===undefined){
    message = new Array;
  }
  if (formName===undefined){
    formName = null;
  }
  
  for(i=0;i<ids.length;i++){
    if (document.getElementById(ids[i]) !== null) {
      var elem = document.getElementById(ids[i]);
      elem.value = trim(elem.value);
      if (elem.name=='web' && elem.value != antispamAn) {
        elem.style.borderColor = borders[1];
        error += ' • '+message[4]+"\n";
      } else if (elem.name=='email' && !emailRegex.test(elem.value)) {
        elem.style.borderColor = borders[1];
        error += ' • '+message[2]+' '+(!labels[i]?ids[i]:labels[i])+' '+message[3]+"\n";
      
      } else if (elem.name=='datetime' && !dtimeRegex.test(elem.value)) {
        elem.style.borderColor = borders[1];
        error += ' • '+message[2]+' '+(!labels[i]?ids[i]:labels[i])+' '+message[3]+"\n";   
      
      } else if (elem.value=='') {
        elem.style.borderColor = borders[1];
        error += ' • '+message[0]+' '+(!labels[i]?ids[i]:labels[i])+' '+message[1]+"\n";
      } else {
        elem.style.borderColor = borders[0];
      }
    }
  }
  
  if (error!='') {
    alert(error);
    return false;
  } else {
    if (formName == 'download') {
      document.getElementById('success').style.display='block';
      document.getElementById('form').style.display='none';
    }
    return true;
  }
}

function createRequest() { 
  var result; 
  try { 
    result = new XMLHttpRequest(); 
  } 
  catch (e) { 
    result = new ActiveXObject('Microsoft.XMLHTTP'); 
  } 
  return result; 
} 

function req(url) { 
  request=createRequest(); 
  request.open('GET',url,false); 
  request.send(null); 
  return true; 
}

function vlozTag(tag, parovy, text, prependText, appendText) {
	var textarea = document.getElementById('text');
	if (typeof parovy == 'undefined') {
		var parovy = true;
	}
	if (typeof prependText == 'undefined') {
		var prependText = '';
	}
	if (typeof appendText == 'undefined') {
		var appendText = '';
	}
	if (typeof text == 'undefined') {
		var tagText = getTextareaSelection();
	} else {
		var tagText = text;
	}
	var startTag;
	var endTag;
	if (!parovy) {
	  startTag = '\n\n['+tag+']\n\n';
		endTag = '';
	} else {
	  startTag = '['+tag+']';
	  endTag = '[/'+tag+']';
	}
	if (tag == 'url') {
		if (tagText == '') {
			tagText = 'Odkaz';
		}
		var regexp = new RegExp("^((http|https|ftp)\\://)([a-zA-Z0-9\\.\\-]+(\\:[a-zA-Z0-9\\.&%\\$\\-]+)*@)?((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|([a-zA-Z0-9\\-]+\\.)*[a-zA-Z0-9\\-]+\\.[a-zA-Z]{2,4})(\\:[0-9]+)?(/[^/][a-zA-Z0-9\\.\\,\\?\\'\\\\/\\+&%\\$#\\=~_\\-@]*)*$");
		var regexp2 = new RegExp("^([a-zA-Z0-9\\.\\-]+(\\:[a-zA-Z0-9\\.&%\\$\\-]+)*@)?((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|www\\.([a-zA-Z0-9\\-]+\\.)*[a-zA-Z0-9\\-]+\\.[a-zA-Z]{2,4})(\\:[0-9]+)?(/[^/][a-zA-Z0-9\\.\\,\\?\\'\\\\/\\+&%\\$#\\=~_\\-@]*)*$");
		
		if (regexp.test(tagText)) {
			startTag = '[url=' + tagText + ']';
		} else if (regexp2.test(tagText)) {
			startTag = '[url=http://' + tagText + ']';
		} else {
			startTag = '[url=http://example.com]';
			selectionStart = prependText.length + 5;
			selectionEnd = prependText.length + 23;
		}
	}
	var text2insert = prependText + startTag + tagText + endTag + appendText;
	textarea.focus();
	if (typeof textarea.selectionStart != 'undefined') {
		var start = textarea.selectionStart;
		var end = textarea.selectionEnd;
		textarea.value = textarea.value.substr(0, start) + text2insert + textarea.value.substr(end);
		if (typeof selectionStart != 'undefined' && typeof selectionEnd != 'undefined') {
			textarea.selectionStart = start + selectionStart;
			textarea.selectionEnd = start + selectionEnd;
		} else {
			if (tagText == '') {
				textarea.selectionStart = start + prependText.length + startTag.length;
				textarea.selectionEnd = start + prependText.length + startTag.length;
			} else {
				textarea.selectionStart = start + text2insert.length;
				textarea.selectionEnd = start + text2insert.length;
			}
		}
	}
	else if (typeof document.selection != 'undefined') {
		var range = document.selection.createRange();
		range.text = text2insert;

		if (typeof selectionStart != 'undefined' && typeof selectionEnd != 'undefined') {
			range.moveStart('character', -text2insert.length + selectionStart);
			range.moveEnd('character', -text2insert.length + selectionEnd);
		} else {
			if (tagText == '') {
				range.move('character', -(endTag.length + appendText.length));
			} else {
			  
			}
		}
		range.select();
	}
	delete selectionStart;
	delete selectionEnd;
}

function getTextareaSelection() {
	var textarea = document.getElementById('text');
	if (typeof textarea.selectionStart != 'undefined') {
		var selection = textarea.value.substring(textarea.selectionStart, textarea.selectionEnd);
	} else if (typeof document.selection != 'undefined') {
		var selection = document.selection.createRange().text;
	} else {
	
	}
	return selection;
}