Georgian keyboard jquery plugin

geoKeyboard.jquery.js

/*!
 * Georgian Keyboard Plugin for jQuery
 * Copyright (c) 2012 Levan Melikishvili.
 * Licensed under the MIT license.
 * Version: 0.1
 *
 
example usage:
$('form_selector').geoKeyboard();

parameters:
* (bool)enable - activate or deactivate the plugin by default
* (string)switcher - the id of the switcher checkbox
 
 */

jQuery.fn.extend({
	insertAtCaret: function(myValue){
		return this.each(function(i) {
			if (document.selection) {
				//For browsers like Internet Explorer
				this.focus();
				sel = document.selection.createRange();
				sel.text = myValue;
				this.focus();
			}
			else if (this.selectionStart || this.selectionStart == '0') {
				//For browsers like Firefox and Webkit based
				var startPos = this.selectionStart;
				var endPos = this.selectionEnd;
				var scrollTop = this.scrollTop;
				this.value = this.value.substring(0, startPos)+myValue+this.value.substring(endPos,this.value.length);
				this.focus();
				this.selectionStart = startPos + myValue.length;
				this.selectionEnd = startPos + myValue.length;
				this.scrollTop = scrollTop;
				} else {
				this.value += myValue;
				this.focus();
			}
		});
	}
});

jQuery.fn.geoKeyboard =  function(options) {
	var settings = $.extend({
			'enable': true, //this plugin is enabled by default
			'switcher': 'switcher' //the id of the switcher checkbox
		}, options),
		
		latin = 'abgdevzTiklmnopJrstufqRySCcZwWxjh',
		isEnabled = settings.enable,
		switcher = $('input#' + settings.switcher);
	
	//check/uncheck the checkbox if the plugin is enabled/disabled from settings (enabled by default)
	switcher.prop("checked", settings.enable);
	
	//enable/disable the plugin if the checkbox is checked/unchecked
	$(switcher).change(function() {
		isEnabled = switcher.prop('checked');
	});
	
	return this.find('input, textarea').each(function() {
		var $this = $(this);
					
		$this.keypress(function(e) {
			var	code = e.keyCode ? e.keyCode : e.charCode,
				i = latin.indexOf( String.fromCharCode( code ) );
			
			//enabling/disabling by pressing the ~ key while typing
			if (code == 96) {
				isEnabled = !isEnabled;
				switcher.prop("checked", !switcher.prop("checked"));
				e.preventDefault();
			}
				
			if ( ! isEnabled ) return;
			
			if ( i > -1 ) {
				$this.insertAtCaret( String.fromCharCode( i + 4304 ) );
				$("#switcher").focus();
				$(this).focus();
				e.preventDefault();
			}
		});
	});
};