var clientVer = parseInt(navigator.appVersion); // Get browser version
var clientPC = navigator.userAgent.toLowerCase(); // Get client info
var is_ie = ((clientPC.indexOf('msie') != -1) && (clientPC.indexOf('opera') == -1));
var is_win = ((clientPC.indexOf('win') != -1) || (clientPC.indexOf('16bit') != -1));
var baseHeight;

function clockSet() {
  var now = new Date();
  var hour = now.getHours();
  var min = now.getMinutes();
  var sec = now.getSeconds();

  for(var i=1; i<7; i++) {
    if(document.getElementById("time"+i) == null) {
		return; //layout je type 1
	}	
  }
  
  document.getElementById("time1").src = "images/web/"+(Math.floor(hour/10))+".gif"; 
  document.getElementById("time2").src = "images/web/"+(hour % 10)+".gif";

  document.getElementById("time3").src = "images/web/"+(Math.floor(min/10))+".gif";
  document.getElementById("time4").src = "images/web/"+(min % 10)+".gif";
  
  document.getElementById("time5").src = "images/web/"+(Math.floor(sec/10))+".gif";
  document.getElementById("time6").src = "images/web/"+(sec % 10)+".gif";
  
  document.getElementById("tv-clock").style.visibility = "visible";
  
  setTimeout("clockSet()", 1000);
}

function email() {
	var url = prompt("Zadejte adresu emailu","@");
	if(url == null || url == "") {
		return;
	}
	insert_text('[url=mailto:'+url+']'+url+'[/url]', false);
}

function urlWithTitle() {
	var url = prompt("Zadejte adresu odkazu");
	if(url == null || url == "") {
		return;
	}

	var title = prompt("Zadejte popisek odkazu","zde");
	if(title == null || title == "") {
		return;
	}
	
	insert_text('[url='+url+']'+title+'[/url]', false);
}


function swapImage(obj, is_on) {
  var img = obj.src.substring(0, obj.src.lastIndexOf("_"));
  if(is_on) {
    img += "_on.gif";
  }
  else {
    img += "_off.gif";
  }
  
  obj.src = img;
}

function insert_text(text, spaces)
{
	var textarea;
	
	textarea = document.forms["guestbook_form"].elements["text"];
	
//	var textarea = document.getElementById("post_text");
	
	if (spaces) 
	{
		text = ' ' + text + ' ';
	} 
	
	if (!isNaN(textarea.selectionStart))
	{
		var sel_start = textarea.selectionStart;
		var sel_end = textarea.selectionEnd;

		mozWrap(textarea, text, '')
		textarea.selectionStart = sel_start + text.length;
		textarea.selectionEnd = sel_end + text.length;
	}
	else if (textarea.createTextRange && textarea.caretPos)
	{
		if (baseHeight != textarea.caretPos.boundingHeight) 
		{
			textarea.focus();
			storeCaret(textarea);
		}

		var caret_pos = textarea.caretPos;
		caret_pos.text = caret_pos.text.charAt(caret_pos.text.length - 1) == ' ' ? caret_pos.text + text + ' ' : caret_pos.text + text;
	}
	else
	{
		textarea.value = textarea.value + text;
	}
	textarea.focus();
} 

function mozWrap(txtarea, open, close)
{
	var selLength = txtarea.textLength;
	var selStart = txtarea.selectionStart;
	var selEnd = txtarea.selectionEnd;
	var scrollTop = txtarea.scrollTop;

	if (selEnd == 1 || selEnd == 2) 
	{
		selEnd = selLength;
	}

	var s1 = (txtarea.value).substring(0,selStart);
	var s2 = (txtarea.value).substring(selStart, selEnd)
	var s3 = (txtarea.value).substring(selEnd, selLength);

	txtarea.value = s1 + open + s2 + close + s3;
	txtarea.selectionStart = selEnd + open.length + close.length;
	txtarea.selectionEnd = txtarea.selectionStart;
	txtarea.focus();
	txtarea.scrollTop = scrollTop;

	return;
}

/**
* Insert at Caret position. Code from
* http://www.faqts.com/knowledge_base/view.phtml/aid/1052/fid/130
*/
function storeCaret(textEl)
{
	if (textEl.createTextRange)
	{
		textEl.caretPos = document.selection.createRange().duplicate();
	}
} 

function bbfontstyle(bbopen, bbclose)
{
	theSelection = false;

	var textarea = document.getElementById("post_text");

	textarea.focus();

	if ((clientVer >= 4) && is_ie && is_win)
	{
		// Get text selection
		theSelection = document.selection.createRange().text;

		if (theSelection)
		{
			// Add tags around selection
			document.selection.createRange().text = bbopen + theSelection + bbclose;
			textarea.focus();
			theSelection = '';
			return;
		}
	}
	else if (textarea.selectionEnd && (textarea.selectionEnd - textarea.selectionStart > 0))
	{
		mozWrap(textarea, bbopen, bbclose);
		textarea.focus();
		theSelection = '';
		return;
	}
	
	//The new position for the cursor after adding the bbcode
	var caret_pos = getCaretPosition(textarea).start;
	var new_pos = caret_pos + bbopen.length;		

	// Open tag
	insert_text(bbopen + bbclose);

	// Center the cursor when we don't have a selection
	// Gecko and proper browsers
	if (!isNaN(textarea.selectionStart))
	{
		textarea.selectionStart = new_pos;
		textarea.selectionEnd = new_pos;
	}	
	// IE
	else if (document.selection)
	{
		var range = textarea.createTextRange(); 
		range.move("character", new_pos); 
		range.select();
		storeCaret(textarea);
	}

	textarea.focus();
	return;
}

function getCaretPosition(txtarea)
{
	var caretPos = new caretPosition();
	
	// simple Gecko/Opera way
	if(txtarea.selectionStart || txtarea.selectionStart == 0)
	{
		caretPos.start = txtarea.selectionStart;
		caretPos.end = txtarea.selectionEnd;
	}
	// dirty and slow IE way
	else if(document.selection)
	{
	
		// get current selection
		var range = document.selection.createRange();

		// a new selection of the whole textarea
		var range_all = document.body.createTextRange();
		range_all.moveToElementText(txtarea);
		
		// calculate selection start point by moving beginning of range_all to beginning of range
		var sel_start;
		for (sel_start = 0; range_all.compareEndPoints('StartToStart', range) < 0; sel_start++)
		{		
			range_all.moveStart('character', 1);
		}
	
		txtarea.sel_start = sel_start;
	
		// we ignore the end value for IE, this is already dirty enough and we don't need it
		caretPos.start = txtarea.sel_start;
		caretPos.end = txtarea.sel_start;			
	}

	return caretPos;
}

function caretPosition()
{
	var start = null;
	var end = null;
}