var banner = Array();
var kolicina=0;
var curr=0;

function prepareBanners() {
	var container = document.getElementById("fla");
	var banners = container.getElementsByTagName("div");
	for ( var i = 0; i < banners.length; i++ ) {
		var div = banners[ i ];
		banner.push(div.id);
	}
	for ( i=0; i < banner.length; i++ ) {
		kolicina++;
	}
	bannerToggle();
}
						   
function bannerToggle() {
	if (kolicina == 1) {
		return;
	}	
	var rand=Math.floor(Math.random()*kolicina);						
	for (j=0; j < banner.length; j++ ) {
		var b = document.getElementById(banner[j]);
		if(rand==j) {
			b.style.display='block';
			curr=j;
		} 
		else b.style.display='none';
	}	
	setInterval (swap,7000);
}

function swap(){
	var rand=Math.floor(Math.random()*kolicina);
	while (rand==curr) {
		rand=Math.floor(Math.random()*kolicina);
	}
	document.getElementById(banner[curr]).style.display='none';
	for (j=0; j < banner.length; j++ ) {
		var b = document.getElementById(banner[j]);
		if(rand==j) {
			b.style.display='block';
			curr=j;
		}
		else b.style.display='none';
	}	
}

prepareBanners();
//addOnLoad(prepareBanners);