function $T(i,v) { return((typeof(i)=='string'?$(i):(i?i:document)).getElementsByTagName(v)); }
function trim(s) { return(s.replace(/^\s+|\s+$/g, '')); }

function addEvent( obj, type, fn ) {
	if (obj.addEventListener) {
		obj.addEventListener( type, fn, false );
		EventCache.add(obj, type, fn);
	}
	else if (obj.attachEvent) {
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
		EventCache.add(obj, type, fn);
	}
	else {
		obj["on"+type] = obj["e"+type+fn];
	}
}

var 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;
			};
		}
	};
}();

//	GLOBAL VARIABLES FOR SHOWING AND HIDING THE next/prev BUTTONS ON THE PORTFOLIO DETAIL PAGE
var timeoutID;
var growing;

function init() {
	var header = $('header');
	var overlay = $('imgoverlay');
	addEvent(header,'mouseover',showOverlay(overlay), false);
	addEvent(header,'mouseout',hideOverlay(overlay), false);
}

function showOverlay(overlay) {
	return function(e) {		
		if(timeoutID) window.clearTimeout(timeoutID);
		if(!growing) {
			doShowOverlay(overlay);
			growing = true;
			window.setTimeout(function() { growing = false }, 400);
		}
	}
}

function doShowOverlay(overlay) {
	overlay.morph('height:45px', {duration:0.4});
}

function hideOverlay(overlay) {
	return function(e) {
		timeoutID = window.setTimeout( function() {
			doHideOverlay(overlay)
			}, 800);
	}
}

function doHideOverlay(overlay) {
	overlay.morph('height:0px', {duration:0.4});
}

addEvent(window,'load',init, false);
addEvent(window,'unload',EventCache.flush);