var imageTag = false;
var theSelection = false;

var clientPC = navigator.userAgent.toLowerCase();
var clientVer = parseInt(navigator.appVersion);

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 ajtBBCode(Tag, fTag, id)
{	
	var doc;
	if (navigator.appName != "Microsoft Internet Explorer") {
		if (document.forms[0])
		{
			doc = document;
		}
		else 
		{
			doc = opener.document;
		}
		
		var textarea = doc.getElementById(id);
		if (is_ie && typeof(baseHeight) != 'number')
		{	
			textarea.focus();
			baseHeight = doc.selection.createRange().duplicate().boundingHeight;

			if (!document.forms[0])
			{
				document.body.focus();
			}
		}
		
		if (Tag != -1)
		{
			bbfontstyle(id, Tag, fTag);
		} 
		else 
		{
			insert_text('[*]', id);
			document.document.getElementById(id).focus();
		}
	
	
	} else {
		var obj = document.getElementById(id), sel;
	 obj.focus();
	 if (document.selection && document.selection.createRange){//if ie
		 sel = document.selection.createRange();
		 if (sel.parentElement()==obj)//si sel est dans obj
	sel.text = Tag+sel.text+fTag;
	 }
	 else if(String(typeof obj.selectionStart)!="undefined"){
	 
		 var longueur= parseInt(obj.textLength);
		 var selStart = obj.selectionStart;
		 var selEnd = obj.selectionEnd;
		 if (selEnd == 2 || selEnd == 1)selEnd = longueur;

		 obj.value = (obj.value).substring(0,selStart) +
								Tag +
			(obj.value).substring(selStart,selEnd) +
									 fTag +
		(obj.value).substring(selEnd,longueur);
	 }
	else obj.value+=Tag+fTag;
	obj.focus();
}
	
}

/*function ajtBBCode(Tag, fTag, id)
{

} */

function bbfontstyle(id, bbopen, bbclose)
{
	theSelection = false;
		
	var textarea = document.getElementById(id);

	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;
			document.getElementById(id).focus();
			theSelection = '';
			return;
		}
	}
	else if (document.getElementById(id).selectionEnd && (document.getElementById(id).selectionEnd - document.getElementById(id).selectionStart > 0))
	{
		mozWrap(document.getElementById(id), bbopen, bbclose);
		document.getElementById(id).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, id);

	// 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;
}

/**
* Insert text at position
*/
function insert_text(text, id, spaces, popup)
{
	var textarea;
	
	if (!popup) 
	{
		textarea = document.getElementById(id);
	} 
	else 
	{
		textarea = opener.document.getElementById(id);
	}
	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;
	}
	if (!popup) 
	{
		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 caretPosition()
{
	var start = null;
	var end = null;
}

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;
}