function preloadImages(a){
	_imagecache = new Array();
	
	for(var i=0; i<a.length; i++){
		_imagecache[_imagecache.length] = new Image();
		_imagecache[_imagecache.length-1].src = a[i];
	}
}
function hideMenu(){
	//document.getElementById('menu').style.visibility='hidden';
}