var clientPC = navigator.userAgent.toLowerCase(); // Get client info

var is_gecko = (
	(clientPC.indexOf('gecko')!=-1) && (clientPC.indexOf('spoofer')==-1) && (clientPC.indexOf('khtml') == -1) && (clientPC.indexOf('netscape/7.0')==-1)
);

/**
 * we use it to avoid creating the toolbar where javascript is not enabled
 */
function addButton( imageFile, speedTip, tagOpen, tagClose, sampleText, imageWidth, imageHeight ) {

	imageFile = escapeQuotesHTML(imageFile);
	speedTip = escapeQuotesHTML(speedTip);
	tagOpen = escapeQuotes(tagOpen);
	tagClose = escapeQuotes(tagClose);
	sampleText = escapeQuotes(sampleText);
	imageWidth = escapeQuotesHTML(imageWidth);
	imageHeight = escapeQuotesHTML(imageHeight);

	var mouseOver = "";

	// we can't change the selection, so we show example texts
	// when moving the mouse instead, until the first button is clicked
	if ( !document.selection && !is_gecko ) {

		// filter backslashes so it can be shown in the infobox
		var re = new RegExp("\\\\n", "g");

		tagOpen = tagOpen.replace(re, "");
		tagClose = tagClose.replace(re, "");

		mouseOver = "onMouseover=\"if(!noOverwrite){document.infoform.infobox.value='"+tagOpen+sampleText+tagClose+"'};\"";
	}

	document.write("<a href=\"javascript://\" onclick=\"insertTags");
	document.write("('"+tagOpen+"','"+tagClose+"','"+sampleText+"');\">");

	document.write("<img src=\""+imageFile+"\" width=\""+imageWidth+"\" height=\""+imageHeight+"\" border=\"0\" alt=\""+speedTip+"\" title=\""+speedTip+"\""+mouseOver+" />");
	document.write("</a>");

	return;
}

/**
 *
 */
function escapeQuotes(text) {

	var re;
	
	re = new RegExp("'", "g");
	text = text.replace(re, "\\'");

	re = new RegExp("\\n", "g");
	text = text.replace(re, "\\n");

	return escapeQuotesHTML(text);
}

/**
 *
 */
function escapeQuotesHTML(text) {

	var re;

	re = new RegExp('&', "g");
	text = text.replace(re, "&amp;");

	re = new RegExp('"', "g");
	text = text.replace(re, "&quot;");

	re = new RegExp('<', "g");
	text = text.replace(re, "&lt;");

	re = new RegExp('>', "g");
	text = text.replace(re, "&gt;");

	return text;
}

/**
 * apply tagOpen/tagClose to selection in textarea,
 * use sampleText instead of selection if there is none
 * copied and adapted from phpBB
 */
function insertTags(tagOpen, tagClose, sampleText) {

    var txtarea = document.getElementById('message_text');

	// IE
	if ( document.selection && !is_gecko ) {

		var theSelection = document.selection.createRange().text;

		if ( !theSelection ) {
			theSelection = sampleText;
		}

		txtarea.focus();

		if ( theSelection.charAt(theSelection.length - 1) == " " ) { // exclude ending space char, if any
			theSelection = theSelection.substring(0, theSelection.length - 1);
			document.selection.createRange().text = tagOpen + theSelection + tagClose + " ";
		} else {
			document.selection.createRange().text = tagOpen + theSelection + tagClose;
		}

	// Mozilla
	} else if ( txtarea.selectionStart || txtarea.selectionStart == '0' ) {

 		var startPos = txtarea.selectionStart;
		var endPos = txtarea.selectionEnd;
		var scrollTop = txtarea.scrollTop;
		var myText = txtarea.value.substring(startPos, endPos);

		if ( !myText ) {
			myText = sampleText;
		}

		if ( myText.charAt(myText.length - 1) == " " ) { // exclude ending space char, if any
			subst = tagOpen + myText.substring(0, (myText.length - 1)) + tagClose + " ";
		} else {
			subst = tagOpen + myText + tagClose;
		}

		txtarea.value = txtarea.value.substring(0, startPos) + subst + txtarea.value.substring(endPos, txtarea.value.length);
		txtarea.focus();

		var cPos = startPos+(tagOpen.length+myText.length+tagClose.length);

		txtarea.selectionStart = cPos;
		txtarea.selectionEnd = cPos;
		txtarea.scrollTop = scrollTop;

	// All others
	} else {

		var copy_alertText = alertText;

		var re1 = new RegExp("\\$1", "g");
		var re2 = new RegExp("\\$2", "g");

		copy_alertText = copy_alertText.replace(re1, sampleText);
		copy_alertText = copy_alertText.replace(re2, tagOpen+sampleText+tagClose);

		var text = "";
		if (sampleText) {
			text = prompt(copy_alertText);
		}
		if ( !text ) {
			text = sampleText;
		}

		text = tagOpen+text+tagClose;

		document.infoform.infobox.value = text;

		// in Safari this causes scrolling
		if ( !is_safari ) {
			txtarea.focus();
		}

		noOverwrite = true;
	}

	// reposition cursor if possible
	if ( txtarea.createTextRange ) {
		txtarea.caretPos = document.selection.createRange().duplicate();
	}
}