var num_images_ = 9;

function changelogo(num)
{
	document.getElementById("logo_img_src").innerHTML = "<img src=\"http://zloi-online.ucoz.net/headers/t"+num+".png\">";
	var nextnum = num;
	while(nextnum == num) nextnum = Math.floor(Math.random()*num_images_);
	setTimeout("changelogo("+nextnum+");",30000);
}

changelogo(Math.floor(Math.random()*num_images_));