/* Copyright (C) 2010 Daniel Gründl - http://dgfire.de/
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 * 	  
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 * 	  
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

function olEvent() {
	this.version = '20101220-1225';

	this.observe = function (elem, name, func) {
		var capture = (arguments[3]) ? arguments[3] : false;
		if (elem.addEventListener)
			elem.addEventListener(name, func, capture);
		else if (elem.attachEvent)
			elem.attachEvent('on' + name, func);
	};

	this.stop = function (e) {
		if (e.preventDefault) { 
		  e.preventDefault(); 
		  e.stopPropagation(); 
		} else
		  e.returnValue = false;
	};	

	this.remove = function (elem, name, func) {
		var capture = (arguments[3]) ? arguments[3] : false;
		if (elem.removeEventListener)
			elem.removeEventListener(name, func, capture);
		else if (elem.detachEvent)
			elem.detachEvent('on' + name, func);		
	};

	this.getX = function (e) {
		return (e.pageX) ? e.pageX : e.clientX + document.body.scrollLeft;
	};
	
	this.getY = function (e) {
		return (e.pageY) ? e.pageY : e.clientY + document.body.scrollTop;
	};

	this.setPosition = function(el, x, y){
		if(x<0 || y<0)
			this.center(el);
		else {
			el.style.position = 'absolute';
			el.style.left = x +'px';
			el.style.top = y +'px';
			el.style.display = 'block';
		}
	};
	
	this.center = function(el){
		el.style.display = 'block';
		el.style.position = 'absolute';
		var w = document.body.scrollLeft + document.body.clientWidth;
		var yoff = ((typeof (window.pageYOffset)) != 'undefined')
			? window.pageYOffset
			: document.body.scrollTop;

		var x = (w - el.offsetWidth) >> 1;
		var y = yoff + ((window.innerHeight - el.offsetHeight)>>1)

		if (x < 0) x = 0;
		if (y < 0) y = 0;
		
		el.style.left = x + 'px';
		el.style.top = y + 'px';
	};

	return this;
}

//create onDOMReady Event
document.onDOMReady = function(fn){
	// Initialize event depending on browser
	if(document.addEventListener) // W3C-compliant browser
		olEvent().observe(document, "DOMContentLoaded", fn);
	else //IE
		olEvent().observe(document, "readystatechange", function(){
			if(document.readyState == "interactive" || document.readyState == "complete")
				fn(); // DOM is ready
		});
}