function $(id) {
	return document.getElementById(id);
}
function updateseccode() {
	var rand = Math.random();
	$('seccodeimage').innerHTML = '<img id="seccode" onclick="updateseccode()" src="' + blogurl + 'seccode.php?update=' + rand + '" class="codeimg" alt="单击图片换张图片" />';
}



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 = "topjs.goTop(" + acceleration + ", " + time + ")"
		window.setTimeout(invokeFunction, time);
	}
}
window['topjs'] = {};
window['topjs']['$'] = $;
window['topjs']['goTop'] = goTop;