//- $ - getElementById
function qtz_$(id) {
	return document.getElementById(id);
}



//- Toggle function
function qtz_toggle(id) {
	elm = qtz_$(id);
	if(elm.style.display == 'none') {
		elm.style.display = 'block';
	}
	else {
		elm.style.display = 'none';
	}
}



//- Change innerHTML 
function qtz_switch_innerHTML(id, innerHTML_1, innerHTML_2) {
	elm = qtz_$(id);
	if(elm.innerHTML == innerHTML_1 || elm.innerHTML == '') {
		elm.innerHTML = innerHTML_2;
	}
	else {
		elm.innerHTML = innerHTML_1;
	}	
}



// Bold Button
qtz_$("qtz_button_bold").onclick = function () {  
	qtz_code("B"); 
}
// Italic Button
qtz_$("qtz_button_italic").onclick = function () {
	qtz_code("I");
}
// Underlined Button
qtz_$("qtz_button_underline").onclick = function () {  
	qtz_code("U");
}
// Strike Button
qtz_$("qtz_button_strike").onclick = function () { 
	qtz_code("S");
}
// Link Button
qtz_$("qtz_button_link").onclick = function () {   
	qtz_code("Url");
}
// Quote Button
qtz_$("qtz_button_quote").onclick = function () {  
	qtz_code("Quote"); 
}
// Increase Button
qtz_$("qtz_button_up").onclick = function () {   
	qtz_resizeTextarea(100);  
}
// Decrease Button
qtz_$("qtz_button_dwn").onclick = function () {
	qtz_resizeTextarea(-100); 
}
	// Zmilie Button
	qtz_$("qtz_button_zmilies").onclick = function ()  
	{
		if(this.title == "Zmilies anzeigen")	{   
			this.title = "Zmilies verstecken";
		}
		else {
			this.title = "Zmilies anzeigen";  
		}  
		qtz_toggle("qtz_zmilies_toggle_wrapper"); 
	} 



// qtz_code
function qtz_code(qtz_tag) {
	var aTag, eTag;
	 
	switch (qtz_tag) {
		case 'B':
			aTag = '<strong>';
			eTag = '</strong>';
		break;	
		case 'I':
			aTag = '<em>';
			eTag = '</em>';
		break;	
		case 'U':
			aTag = '<u>';
			eTag = '</u>';
		break;	
		case 'S':
			aTag = '<strike>';
			eTag = '</strike>';
		break;
		case 'Url':
			qtz_url();
		return;
		case 'Quote':
			qtz_quote();
		return;
		default: // Smilies
			aTag = ' ' + qtz_tag + ' ';
			eTag = '';
	}	
	qtz_insert(aTag, eTag);
}



// qtz_url
function qtz_url() {	
	var url = prompt('Link (mit http://)', 'http://');
	if(url)	{
		qtz_insert('<a href="' + url + '">', '</a>');
	}
}



// qtz_quote
function qtz_quote() {	
	var author = prompt('Name des Autors (Optional)', '');
	if(author.length > 0)	{
		var aTag = '<blockquote><strong>' + author + ': </strong>';
	}
	else {
		var aTag = '<blockquote>';
	}		
	qtz_insert(aTag, '</blockquote>');
}



// qtz_insert
// Original source: http://aktuell.de.selfhtml.org/artikel/javascript/bbcode/
// Castrated and edited by Zfen
function qtz_insert(aTag, eTag)
{
	var input = qtz_$('comment');
	input.focus();    
    
	//- Gecko Area
	if(typeof input.selectionStart != 'undefined') {
		var start = input.selectionStart;
		var end = input.selectionEnd;		
		
		var scrollTop = input.scrollTop;
		
		var insText = qtz_rTrimString(input.value.substring(start, end));
		input.value = input.value.substr(0, start) + aTag + insText + eTag + qtz_whitespace + input.value.substr(end);
        
		var pos;
		if (insText.length == 0) {
			pos = start + aTag.length;
		}
		else {
			pos = start + aTag.length + insText.length + eTag.length;
		}
		input.selectionStart = pos;
		input.selectionEnd = pos;
		input.scrollTop = scrollTop;
	}    
	//- IE Area
	else if(typeof document.selection != 'undefined') {
		var range = document.selection.createRange();
		var insText = qtz_rTrimString(range.text);
		range.text = aTag + insText + eTag + qtz_whitespace;
		
		range = document.selection.createRange();
		if (insText.length == 0) {
			range.move('character', -eTag.length);
		}
		else {
			range.moveStart('character', aTag.length + insText.length + eTag.length + qtz_whitespace.length); 
		}
		range.select();
	}
}



// Last sign is a whitespace? remove it!
function qtz_rTrimString(myString) {
	qtz_whitespace = '';
	var lastSign = myString.substring(myString.length-1);
	if( lastSign == ' ') {
		qtz_whitespace = ' ';
		return myString.replace( /\s+$/g, "" );
	}
	else {
		return myString;	
	}
} 



// qtz_resizeTextarea
var actualSize = 200;
function qtz_resizeTextarea(size) {
	if((actualSize < 2000 && size > 0) || (actualSize >= 200 && size < 0)) {
		actualSize += size;
		qtz_$("comment").style.height = actualSize + "px";
	}
}