var imgCount  = document.getElementById("BannerCount").getAttribute("title");
var divId     = 'image_';
var dispNum   = 1;
var arys = new Array();

fncRandList();

function fncRandList() {
	while(arys.length < dispNum){
		var number = parseInt(Math.random()*imgCount) + 1;
		//var number = parseInt(Math.floor(Math.random()*imgCount+1));
		var flag = true;

		for(i = 0; i < arys.length; i++) {
			if(number == arys[i]) {
				flag = false;
			}
		}

		if(flag) {
			arys.push(number);
		}
	}

	fncDisplay();
}


function fncDisplay() {
	for (i = 1 ; i <= imgCount ; i++) {
		document.getElementById(divId + i).style.display = 'none';
	}

	for (i = 0 ; i < arys.length ; i++) {
		document.getElementById(divId + arys[i]).style.display = 'block';
	}
}