//垂直滚动 格式：new zjScroll("标记ID",每次滚动高度(px),滚动速度(ms),间隔时间(ms));
function zjScroll(){
	this.id = arguments[0];
	if(this.id == null) this.id = "";
	this.height = arguments[1];
	if(this.height == null) this.height = 20;
	this.speed = arguments[2];
	if(this.speed == null) this.speed = 20;
	this.delay = arguments[3];
	if(this.delay == null) this.delay = 2000;
	this.ispause = false;
	this.sctop = 0;
	this.step = 0;
	this.flag = true;
	var idcnt;
	if(!(this.id == "")){
		idcnt = $(this.id).innerHTML;
		$(this.id).innerHTML = "<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr><td id=\"" + this.id + "_S1\">" + idcnt + "</td></tr><tr><td id=\"" + this.id + "_S2\">" + idcnt + "</td></tr></table>";
		this.init();
	}
}

zjScroll.prototype.init = function(){
	var myobj = this;
	$(myobj.id).scrollTop = 0;
	myobj.Scroll = function(){
		$(myobj.id).onmouseover = function(){
			myobj.ispause = true;
		}
		$(myobj.id).onmouseout = function(){
			myobj.ispause = false;
		}
		if(myobj.flag){
			myobj.flag = false;
			if(myobj.sctop >= $(myobj.id+"_S1").offsetHeight){
				myobj.sctop = myobj.sctop - $(myobj.id+"_S1").offsetHeight;
				$(myobj.id).scrollTop = myobj.sctop;
			}
			setTimeout(myobj.Scroll, myobj.delay);
			return true;
		}
		if(!myobj.ispause){
			myobj.sctop++;
			myobj.step++;
			$(myobj.id).scrollTop = myobj.sctop;
			if(myobj.step == myobj.height){
				myobj.step = 0;
				myobj.flag = true;
			}
		}
		setTimeout(myobj.Scroll, myobj.speed);
	}
	myobj.Scroll();
}