ninjafy_add = function() {
	var ninjafy_url = 'http://ninjafy.com/';
	var file = 'ninja_';
	var count = 7;
	file += Math.ceil(Math.random()*count) + '.gif';
	var div = document.createElement('div');
	div.style.position = 'fixed';
	
	var height = Math.random()*.9;
	if (typeof(window.innerHeight) == 'number') {
		height = height*window.innerHeight+'px';
	} else if(document.documentElement && document.documentElement.clientHeight) {
		height = height+document.documentElement.clientHeight+'px';
	} else {
		height = height*100+'%'; 
	}
	
	div.style.top = height;
	div.style.left = Math.random()*90 + '%';
	var img = document.createElement('img');
	img.setAttribute('src',ninjafy_url+'img/'+file);
	var body = document.getElementsByTagName('body')[0];
	body.appendChild(div);
	div.appendChild(img);
}