function PrezentDomApi() {
    this.version = '0.1';
    this.eventCache = new PrezentDomApi.EventCache();
    this.actionAttacher = null;
};

// Static domloader variables
PrezentDomApi.domLoad = [];
PrezentDomApi.domLoaderSet = false;

/**
 * TagEvent class.
 * @version 1.0
 */
PrezentDomApi.TagEvent = function (tagName, className, act, func) {
    this.tagName = tagName.toLowerCase();
    this.className = className;
    this.act = act;
    this.func = func;
}
PrezentDomApi.TagEvent.prototype.matches = function(tagName, className) {
    if (tagName.toLowerCase() != this.tagName) {
        return false;
    }
    return (this.className == null || new RegExp(this.className+"[\\W\\s]?").test(className));
};

/**
 * ActionAttacher class.
 * attaches events to tags by their tagName / classname.
 * Use actionAttacher.addTagEvent to add an event to a tag / className combination.
 */
PrezentDomApi.ActionAttacher = function() {
    this.tagEvents = [];
    this.counter = 0;
}

/* Runs onload to attach all TagEvents */
PrezentDomApi.ActionAttacher.prototype.attach = function() {
    var tagEvents = this.tagEvents;
    var tags = [], elems, len, j;

    // Loop trough all tagEvents to retreive tag
    for (var k=0; k < tagEvents.length; k++) {
        if (typeof tags[tagEvents[k].tagName] != 'undefined') {
            continue;
        }
        // add HTMLCollection to tags array
        tags[tagEvents[k].tagName] = document.getElementsByTagName(tagEvents[k].tagName);
    }

    // Loop trough all tags where events should be attached to
    for (j in tags) {
        elems = tags[j];
        len = elems.length;

        for (var i=0; i < len; i++) {

            // Loop trough events
            for (k=0; k < tagEvents.length; k++) {
                // check if we have a tag- and classname match
                if (tagEvents[k].matches(elems[i].tagName, elems[i].className)) {
                    // Add event on match
                    pDomApi.addEvent(elems[i], tagEvents[k].act, tagEvents[k].func);
                }
            }
        }
    }

};
/* Add tag event to action attacher */
PrezentDomApi.ActionAttacher.prototype.addTagEvent = function (tEvent) {
    this.tagEvents.push(tEvent);
    return this.counter++;
};

PrezentDomApi.prototype.getActionAttacher = function () {
	if (this.actionAttacher) {
		return this.actionAttacher;
	}
	var me = this;
	this.actionAttacher = new PrezentDomApi.ActionAttacher();
	this.addEvent(window, 'domload', function() { me.actionAttacher.attach();});
	return this.actionAttacher;
};

PrezentDomApi.EventCache =  function() {

	var listEvents = [];

	return {
		listEvents : listEvents,
		add : function(node, sEventName, fHandler){
			listEvents.push(arguments);
		},
		flush : function() {
			var i, item;
			for(i = listEvents.length - 1; i >= 0; i = i - 1){
				item = listEvents[i];
				if(item[0].removeEventListener){
					item[0].removeEventListener(item[1], item[2], item[3]);
				};
				if(item[1].substring(0, 2) != "on"){
					item[1] = "on" + item[1];
				};
				if(item[0].detachEvent){
					item[0].detachEvent(item[1], item[2]);
				}
				item[0][item[1]] = null;
			}
		}
	};

};

/* Runs on dom load if needed */
PrezentDomApi.domLoaded = function() {

    if (arguments.callee.done) {
    	return;
    }
    arguments.callee.done = true;

    for (var i = 0;i < PrezentDomApi.domLoad.length;i++) {
        PrezentDomApi.domLoad[i]();
    }
};


/**
 * Sets a classname for element elem, eventually replacing other classname(s)
 * @param   HTMLElement     elem
 * @param   String          className
 * @param   String/Array    replace
 * @since   0.1
 */
PrezentDomApi.prototype.setClassName = function(elem, className, replace) {
    var replaceArr = [className];
    var newClassName = elem.className;

    // determine replace parameter type (note that it can also be undefined, that case is not handled)
    switch ((typeof replace).toLowerCase()) {
        case 'string':
            replaceArr.push(replace);
            break;
        case 'object':
            replaceArr = replaceArr.concat(replace);
            break;
    }

    // replace all classNames in the replaceArray with a space
    for (var i = 0; i < replaceArr.length; i++) {
        newClassName = newClassName.replace(new RegExp("(^|\\s)" + replaceArr[i] + "(\\s|$)", "g"), ' ');
    }
    // set the new classname
    elem.className = newClassName.trim() + (newClassName.length > 0 ? ' ' : '') + className;
};

/**
 * Sets a classname for element elem, eventually replacing other classname(s)
 * @param   Array           elems       Array of HTMLElements
 * @param   String          className
 * @param   String/Array    replace
 * @since   0.1
 */
PrezentDomApi.prototype.setClassNames = function(elems, className, replace) {
    for (var i in elems) {
        this.setClassName(elems[i]);
    }
};

//elem: (string || object) string of elements id, or a reference to the element itself
//act:  (string) eventname without the 'on' prefix. (load, click, mouseover, etc.)
//func: (unquoted string) functionname of the function to execute on event fire.
PrezentDomApi.prototype.addEvent = function(elem, act, func) {

	if (typeof elem == 'string') {
		elem = document.getElementById(elem);
	}

	if (! elem) { return false; }

	if (act == 'domload' && elem == window) {
		this.addDomLoadEvent(func);
	}

	if (window.addEventListener) {
		elem.addEventListener(act, func, false);
		this.eventCache.add(elem, act, func);
	} else if (window.attachEvent) {
		elem["e"+act+func] = func;
		elem[act+func] = function() { elem["e"+act+func](window.event); };
		elem.attachEvent('on'+act, elem[act+func]);
		this.eventCache.add(elem, act, func);
	} else {
		return false;
	}
	return true;
};

PrezentDomApi.prototype.addDomLoadEvent = function(func) {

	PrezentDomApi.domLoad.push(func);
	if (PrezentDomApi.domLoaderSet) {
		return false;
	}

	if (document.addEventListener) {
		document.addEventListener("DOMContentLoaded", PrezentDomApi.domLoaded, null);
	}
	if (/KHTML|WebKit/i.test(navigator.userAgent)) {
		var _timer = setInterval(function()	{
			if (/loaded|complete/.test(document.readyState)) {
				clearInterval(_timer);
				delete _timer;
				PrezentDomApi.domLoaded();
			}
		}, 25);
	}
	/*@cc_on @*/
	/*@if (@_win32)
	var proto = "src='javascript:void(0)'";
	if (location.protocol == "https:") proto = "src=//0";
	document.write("<scr"+"ipt id=__ie_onload defer " + proto + "><\/scr"+"ipt>");
	var script = document.getElementById("__ie_onload");
	script.onreadystatechange = function() {
	    if (this.readyState == "complete") {
	        PrezentDomApi.domLoaded();
	    }
	};
	/*@end @*/
	this.addEvent(window, 'load', PrezentDomApi.domLoaded);
	PrezentDomApi.domLoaderSet = true;
};

//Call this function with the same arguments as you did with AddEvent
//to remove the eventlistener.
PrezentDomApi.prototype.removeEvent = function(elem, act, func) {
	if(typeof elem == 'string') {
		elem = document.getElementById(elem);
	}

	if(!elem) { return false; }

	if(window.removeEventListener) {
		elem.removeEventListener(act, func, false);
	}
	else if(window.detachEvent) {
		elem.detachEvent('on'+act, func);
	}
};

/*
Written by Jonathan Snook, http://www.snook.ca/jonathan
Add-ons by Robert Nyman, http://www.robertnyman.com
Added support for native getElementsByTagName implementation (supported in Firefox 3)
http://ejohn.org/blog/getelementsbyclassname-in-firefox-3/
*/
PrezentDomApi.prototype.getElementsByClassName = function(oElm, strTagName, strClassName){
	var arrReturnElements = [];
	// Check for native getElementsByClassName implementation (FF3, Safari 3.1, Opera 9.5)
	if (oElm.getElementsByClassName) {
	    var arrElements = oElm.getElementsByClassName(strClassName);

	    for(var i=0; i < arrElements.length; i++){
	        if (strTagName == '*' || arrElements[i].tagName.toLowerCase() == strTagName.toLowerCase()) {
	            arrReturnElements.push(arrElements[i]);
	        }
	    }
	    return arrReturnElements;

	}

	var arrElements = (strTagName == "*" && oElm.all) ? oElm.all : oElm.getElementsByTagName(strTagName);

	strClassName = strClassName.replace(/\-/g, "\\-");
	var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
	var oElement;
	for (var i=0; i<arrElements.length; i++){
	    oElement = arrElements[i];
	    if(oRegExp.test(oElement.className)){
	        arrReturnElements.push(oElement);
	    }
	}
	return arrReturnElements;
};

PrezentDomApi.prototype.hasClassName = function(oElm, strClassName) {
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    return oRegExp.test(oElm.className);
};

PrezentDomApi.prototype.showHide = function(elem, hide, show) {
    var hide = hide == undefined ? 'hide' : hide;
    var show = show == undefined ? 'show' : show;

    elem.className = new RegExp(hide).test(elem.className) ?
        elem.className.replace(new RegExp(hide), show) :
        elem.className.replace(new RegExp('\\s?'+ show), '') + ' ' + hide;

};

PrezentDomApi.prototype.preventDefault = function(event) {
    if (event.preventDefault) {
        event.preventDefault();
    } else {
        event.returnValue = false;
    }
};

var pDomApi = new PrezentDomApi();
//flush events
pDomApi.addEvent(window, 'unload', pDomApi.eventCache.flush);

/* Helper functions */
String.prototype.trim = function() {
    var str = this.replace(/^\s\s*/, ''),
        ws = /\s/,
        i = str.length;
    while (ws.test(str.charAt(--i)));
    return str.slice(0, i + 1);
};