/*
Scott Andrew's event attacher
http://www.scottandrew.com/
*/

function addEvent(obj, evType, fn, useCapture){
	// Operu 7+ hacks
	if (window.opera) {
		// Opera doesn't accept attaching events on object window, but accepts them on object document
		if (obj == window) {
			obj = document;
		}
	}

	if (obj.addEventListener){
		obj.addEventListener(evType, fn, useCapture);
		return true;
	} else if (obj.attachEvent){
		var r = obj.attachEvent("on"+evType, fn);
		return r;
	} else {
		return false;
	}
}

function removeEvent(obj, evType, fn, useCapture) {
	// Operu 7+ hacks
	if (window.opera) {
		// Opera doesn't accept detaching events on object window, but accepts them on object document
		if (obj == window) {
			obj = document;
		}
	}

	if (obj.removeEventListener) {
		obj.removeEventListener(evType, fn, useCapture);
		return true;
	} else if (obj.detachEvent) {
		var r = obj.detachEvent("on"+evType, fn);
		return r;
	} else {
		return false;
	}
}

var classMagic = {};

classMagic.add = function (elm, newCl) {
	if (elm && newCl) {
		elm = this.fixElm(elm);
		for (var i = 0; i < elm.length; i++) {
			elm[i].className += (this.get(elm[i])) ? " " + newCl : newCl;
		}
		return true;
	}
	return false;
};

classMagic.has = function (elm, cl) {
	if (elm && cl) {
		if (actCl = this.get(elm)) {
			for (var i = 0; i < actCl.length; i++) {
				if (actCl[i] == cl) {
					return true;
				}
			}
		}
	}
	return false;
}

classMagic.set = function (elm, newCl) {
	if (elm && newCl) {
		elm = this.fixElm(elm);
		for (var i = 0; i < elm.length; i++) {
			elm[i].className = newCl;
		}
		return true;
	}
	return false;
};

classMagic.replace = function (elm, newCl, oldCl) {
	if (elm && newCl && oldCl) {
		elm = this.fixElm(elm);
		for (var i = 0; i < elm.length; i++) {
			var cl;
			var replCl = "";
			if (cl = this.get(elm[i])) {
				for (var j = 0; j < cl.length; j++) {
					replCl += (j > 0) ? " " : "";
					replCl += (cl[j] == oldCl) ? newCl : cl[j];
				}
				elm[i].className = replCl;
			}
		}
		return true;
	}
	return false;
};

classMagic.remove = function (elm, oldCl) {
	if (elm && oldCl) {
		elm = this.fixElm(elm);
		for (var i = 0; i < elm.length; i++) {
			var cl;
			var replCl = "";
			if (cl = this.get(elm[i])) {
				for (var j = 0; j < cl.length; j++) {
					replCl += (j > 0) ? " " : "";
					replCl += (cl[j] == oldCl) ? "" : cl[j];
				}
				elm[i].className = replCl;
			}
		}
		return true;
	}
	return false;
};

classMagic.get = function (elm) {
	if (elm) {
		return (elm.className == "") ? false : elm.className.split(" ");
	}
	return false;
};

classMagic.fixElm = function (elm) {
	if (elm) {
		if (!elm.sort) {
			elm = [elm];
		}
		return elm;
	}
	return false;
}

function fixE(e) {
	if (!e && window.event) e = window.event;
	if (!e.target) e.target = e.srcElement;
	return e;
}