/*!
 * DOMReady
 *
 * Cross browser object to attach functions that will be called
 * immediatly when the DOM is ready.
 *
 * @version   1.0
 * @author    Victor Villaverde Laan
 * @link      http://www.freelancephp.net/domready-javascript-object-cross-browser/
 * @license   MIT license
 */
var DOMReady = (function () {
	var fns = [],
		isReady = false,
		errorHandler = null,
		getFunc = function ( fn ) {
			if ( typeof fn == 'string' )
				return function () { eval( fn ); };
			return fn;
		},
		ready = function () {
			isReady = true;

			// call all registered functions
			for ( var x = 0; x < fns.length; x++ ) {
				try {
					// call function
					fns[x]();
				} catch( err ) {
					// error occured while executing function
					if ( errorHandler )
						errorHandler( err );
				}
			}
		};

	/**
	 * Setting error handler
	 * @param {function|string} fn  When string will be run like code with eval()
	 * @return {this} For chaining
	 */
	this.setOnError = function ( fn ) {
		errorHandler = getFunc( fn );

		// return this for chaining
		return this;
	};

	/**
	 * Add code or function to execute when the DOM is ready
	 * @param {function|string} fn  When string will be run like code with eval()
	 * @return {this} For chaining
	 */
	this.add = function ( fn ) {
		fn = getFunc( fn );

		// call imediately when DOM is already ready
		if ( isReady ) {
			fn();
		} else {
			// add to the list
			fns[fns.length] = fn;
		}

		// return this for chaining
		return this;
	};

	// For all browsers except IE
	if ( window.addEventListener ) {
		document.addEventListener( 'DOMContentLoaded', function(){ ready(); }, false );
	} else {
		// For IE
		// Code taken from http://ajaxian.com/archives/iecontentloaded-yet-another-domcontentloaded
		(function(){
			// check IE's proprietary DOM members
			if ( ! document.uniqueID && document.expando ) return;

			// you can create any tagName, even customTag like <document :ready />
			var tempNode = document.createElement( 'document:ready' );

			try {
				// see if it throws errors until after ondocumentready
				tempNode.doScroll( 'left' );

				// call ready
				ready();
			} catch ( err ) {
				setTimeout( arguments.callee, 0 );
			}
		})();
	}

	return this;
})();