// nastavování cookies # jmeno, hodnota
function setCookie(name, value) {
  var expires = new Date();
  var expires_str=expires.setDate(expires.getDate()+parseInt(365));
  document.cookie = name+"="+value+"; expires="+expires.toGMTString()+"; path=/";
}

// změna klikatelného textu po kliku na něj # id prvku který se má zobrazovat, id prvku na který se kliká, první text, druhý text, jmeno cookie
function zobraz_skryj_a_text(id1, id2, prvni, druhy, cookie) {
  prvek = document.getElementById(id1).style;
  prvek.display = (prvek.display == 'block') ? 'none' : 'block';
  
  if (document.getElementById(id1).style.display == 'none') {
    document.getElementById(id2).innerHTML = prvni;
    setCookie(cookie, druhy);
  } else {
    document.getElementById(id2).innerHTML = druhy;
    setCookie(cookie, prvni);
  }
}

// zobrazování a opětovné skývání textů
  function zobraz_skryj(id) {
    if (document.getElementById(id).style.display == 'none') {
      document.getElementById(id).style.display = 'block';
    } else {
      document.getElementById(id).style.display = 'none';
    }
  }

// Zjištování pozice kurzoru v textaree a vložení tagu
function vlozTag(tag, parovy, text, prependText, appendText)
{
	var textarea = document.getElementById('obsah');
	
	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 = tag;
		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('obsah');
	
	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;
}