/*
Author: mg12
Update: 2008/07/01
Author URI: http://www.fighton.cn/
*/

function setStyleDisplay(id, status) {
	document.getElementById(id).style.display = status;
}

function setStyleBackgroundImage(id, imageURL) {
	document.getElementById(id).style.backgroundImage = "url('imageURL')";
}

function setCookie(name, value, days) {
	if (!days) {
		days = 365;
	}
	var date = new Date();
	date.setTime(date.getTime()+(days*24*60*60*1000));
	var expires = "; expires="+date.toGMTString();
	document.cookie = name+"="+value+expires+"; path=/";
}

function goTop(acceleration, time) {

	acceleration = acceleration || 0.1;
	time = time || 16;

	var dx = 0;
	var dy = 0;
	var bx = 0;
	var by = 0;
	var wx = 0;
	var wy = 0;

	if (document.documentElement) {
		dx = document.documentElement.scrollLeft || 0;
		dy = document.documentElement.scrollTop || 0;
	}
	if (document.body) {
		bx = document.body.scrollLeft || 0;
		by = document.body.scrollTop || 0;
	}
	var wx = window.scrollX || 0;
	var wy = window.scrollY || 0;

	var x = Math.max(wx, Math.max(bx, dx));
	var y = Math.max(wy, Math.max(by, dy));

	var speed = 1 + acceleration;
	window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));
	if(x > 0 || y > 0) {
		var invokeFunction = "goTop(" + acceleration + ", " + time + ")"
		window.setTimeout(invokeFunction, time);
	}
}

function switchImage(imageId, imageUrl, linkId, linkUrl, preview, title, alt) {
	if(imageId && imageUrl) {
		var image = document.getElementById(imageId);
		image.src = imageUrl;

		if(title) {
			image.title = title;
		}
		if(alt) {
			image.alt = alt;
		}
	}

	if(linkId && linkUrl) {
		var link = document.getElementById(linkId);
		link.href = linkUrl;
	}
}