B_MAX_BANNER     =  6;
B_HTML_FILE_HEAD = "468bx";
B_DIV_ID         = "pr_banner_areaB";

function banner_executeB(){
	url = "./bannar/" + B_HTML_FILE_HEAD + (Math.floor(Math.random() * B_MAX_BANNER) + 1) + ".html";
	var objAjax = new Ajax.Request(
		url,
		{
			method:'get',
			onComplete: writeBannerB
		}
	);
}
function writeBannerB(req){
	document.getElementById(B_DIV_ID).innerHTML = req.responseText;
}
banner_executeB();