var banner = new Array(5); 
banner[0] = "images/common2007/home_rotation_01.jpg";
banner[1] = "images/common2007/home_rotation_02.jpg";
banner[2] = "images/common2007/home_rotation_03.jpg";
banner[3] = "images/common2007/home_rotation_04.jpg";
banner[4] = "images/common2007/home_rotation_05.jpg";

function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}

function pickRandom(range) { 
	if(arguments.length == 1) {
		method = "random";
	} else {
		method = arguments[1];
	}
	
	switch(method) {
		case 'random': {
			if (Math.random) {
				return Math.round(Math.random() * (range-1)); 
			} else { 
				var now = new Date(); 
				return (now.getTime() / 1000) % range; 
			} 
			break;
		}
		case 'cookie': {
			imgCounter = readCookie('ImgCounter');
			
			if (imgCounter == null) { imgCounter = 0; }
			else { imgCounter++; }
			
			createCookie('ImgCounter', imgCounter);
			return (imgCounter % range);
		}
	} 
}  

var bannerChoice = pickRandom(banner.length, 'cookie');