/*
	home.js for PLUSMINUSZERO
	update: 2004.12.28
*/


// ////////////////////////////////////
//  toppage image changer
// ////////////////////////////////////

var imgPath = new Array();
var pagePath = new Array();


// change mode setting
var changeMode = 'rotation'; // rotation or random


// image & link setting
imgPath[0]  = 'images/top_picts_017.jpg';
pagePath[0] = 'collection/original/ad01_22intv.html';

imgPath[1]  = 'images/top_picts_015.jpg';
pagePath[1] = 'collection/original/ad03_8intv.html';

imgPath[2]  = 'images/top_picts_005.jpg';
pagePath[2] = 'collection/original/ad02_dvdmd.html';





function putImg() {
	if (changeMode == 'rotation') rotationChange();
	else if (changeMode == 'random') randomChange();
	else rotationChange();
}

// rotation
function rotationChange() {
	var cookieName = 'pmzTopImg';
	var cookieExpires = 30;
	
	var lastImgID = readCookie(cookieName);
	
	var imgNum = imgPath.length;
	var imgID = parseInt(lastImgID) + 1;
	
	if (!imgID) imgID = 0;
	else if (imgID >= imgNum) imgID = 0;
	
	createCookie(cookieName, imgID, cookieExpires);
	createImg(imgPath[imgID], pagePath[imgID]);
}

// random
function randomChange() {
	var imgNum = imgPath.length - 1;
	var imgID = Math.round(Math.random() * imgNum)
	
	createImg(imgPath[imgID], pagePath[imgID]);
}


function createImg(img, page) {
	document.write('<a href="' + page + '"><img src="' + img + '"></a>');
}

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 expires = "";
	var cookieData = name + "=" + value+expires + "; path=/";
	document.cookie = cookieData;
}

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;
}