function rnd_image(){
	var now = new Date();
	var sec_divide = now.getSeconds();
	
	//rnd_number = Math.floor(sec_divide/15); // /20=0, 1, 2 /10=0, 1, 2, 3, 4, 5 etc...
	rnd_number =  (sec_divide%24);
	document.write('<img src="../img/foto' + rnd_number +'.jpg">');
}