// JavaScript Document
var bluebutterfly=function(){}
bluebutterfly.Floater=function(option){
	this.divobj=document.getElementById(option.divid);//控件ID
	this.lrsize=option.lrsize||0;//控件右间距
	this.direction=option.direction||"right";//控件方向
	this.speed=option.speed||10;//飘动速度，最小为1毫秒
	this.step=option.step||0.1;//飘动步长，最小为0.1倍
	//====系统变量=====
	this.lastScrollX=this.lastScrollY=0;
	this.flyObj=null
};
//飘动
bluebutterfly.Floater.prototype.fly=function(){
	var self=this;
	if(self.divobj){
		if(self.speed<1){
			self.speed=1;
		}
		if(self.direction=="right"){
			self.divobj.style.right=self.lrsize;
		}
		else{
			self.divobj.style.left=self.lrsize;
		}
		self.flyObj=window.setInterval(function(){self.flying();},self.speed);
	}
};
//飘动中
bluebutterfly.Floater.prototype.flying=function(){
	var self=this,percent=diffY=diffX=0;
	diffY=document.documentElement.scrollTop;
	diffX=document.documentElement.scrollLeft;
	if(diffY!=self.lastScrollY){
		percent=self.step*(diffY-self.lastScrollY);
		if(percent>0){
			percent = Math.ceil(percent);
		}
		else{
			percent = Math.floor(percent);
		}
		self.divobj.style.top=(parseInt(bluebutterfly.getStyle(self.divobj,"top"))+percent)+"px";
		self.lastScrollY=self.lastScrollY+percent;
	}
	if(diffX!=self.lastScrollX){
		percent=self.step*(diffX-self.lastScrollX);
		if(percent>0){
			percent=Math.ceil(percent);
		}
		else{
			percent=Math.floor(percent);
		}
		self.divobj.style.left=(parseInt(bluebutterfly.getStyle(self.divobj,"left"))+percent)+"px";
		self.lastScrollX=self.lastScrollX+percent;
	}
};
//停止飘动
bluebutterfly.Floater.prototype.stop=function(){
	if(this.flyObj){
		window.clearInterval(this.flyObj);
		this.flyObj=null;
	}
};
bluebutterfly.getStyle=function(target,stylename){
	var curVal="";
	if(typeof(target)!="object"){
		target=bluebutterfly.getElementById(target);
	}
	if (target.currentStyle){ 
		curVal=target.currentStyle[stylename]
	}
	else{ 
		curVal=document.defaultView.getComputedStyle(target, null)[stylename];
	}
	return curVal;
};
var t1=new bluebutterfly.Floater({
	"divid":"menu_bar",
	"lrsize":"2px",
	"direction":"right",
	"speed":"10",
	"step":"0.1"
});
t1.fly();
var t2=new bluebutterfly.Floater({
	"divid":"floater2",
	"lrsize":"2px",
	"direction":"right",
	"speed":"10",
	"step":"0.5"
});