window.onload = on_change;
window.onresize = on_change;
window.onscroll = on_change;
document.getElementById ( "image" ).onload = on_change;

function on_change ( ) {
	var image = document.getElementById ( "image" );
	image.style.top = ( document.documentElement.clientHeight - image.height - 40 ) / 2 + "px";
	image.style.left = ( document.documentElement.clientWidth - image.width - 40 ) / 2 + "px";
}

function on_small_click ( path ) {
	var image = document.getElementById ( "image" );
	image.src = path;
	image.style.display = '';
}

function on_large_click ( ) {
	document.getElementById ( "image" ).style.display = 'none';
}