function makeRequest_banner() {
    http_request = null;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
    } else if (window.ActiveXObject) { // IE
        http_request = new ActiveXObject("Microsoft.XMLHTTP");
    }
    http_request.onreadystatechange = alert_banner;
    http_request.open('GET', "/banner.php?t="+type, true);
    http_request.send(null);
}
function alert_banner() 
{
    if (http_request.readyState == 4) 
    {
        if (http_request.status == 200) 
        {
            set_banner(http_request.responseText);
        }
        else 
        {
            document.documentElement.style.cursor = "auto";
        }
    } 
}
function set_banner(src)
{	
	var source_id;
	if (type == 1) source_id = 'banner_main';
	else source_id = 'banner_right';
		
	if (document.getElementById(source_id))
		document.getElementById(source_id).src = src;

	if(type == 1) {
		if (document.getElementById('banner_right')) type = 2;
	} else {
		if (document.getElementById('banner_main')) type = 1;
	}
	setTimeout("makeRequest_banner()", 10000);
}