var examples = [
	'spider_veins.jpg',
	'varicose_veins1.jpg',
	'varicose_veins2.jpg'
];

function rotate_images(){
	if( !( this.idx >= 0 ) ){
		this.idx = -1;
	}

	this.idx++;
	this.idx %= examples.length;

	var ex = examples[ this.idx ];
	var img = document.getElementById( 'rotate' );
	var cut = img.src.lastIndexOf( '/' ) + 1;
	img.src = img.src.substr( 0, cut ) + ex;

	setTimeout( arguments.callee, 5000 );
}