function img( obj )
{
	document.getElementById( 'highres_picture' ).src = "img/blank.png";
	thumb_source = obj.src.split('/thumbs');
	highres_source = '';

	for ( i = 0 ; i < thumb_source.length ; i++ )
	{
		highres_source += thumb_source[ i ];
	}

	document.getElementById( 'highres_picture' ).src = highres_source;
}
function init()
{
	var n = Math.floor ( Math.random ( ) * 15 + 1 );
	document.getElementById( 'highres_picture' ).src = "img/nursery-school/" + n + ".jpg";
}
window.onload = init;