function Fluture (id,defPic,modPic) {
    this.defPic=defPic;
    this.modPic=modPic;
    this.refObj=document.getElementById(id);
    this.wUp=true;
    this.preloadImage=new Image();
    this.preloadImage.src=this.modPic;
    this.t1=null;
    this.t2=null;
    var _this=this;
    
    this.animate=function () {
        this.flipFlap=Math.round(Math.random()*4)+3;
        this.nr=1;
        this.delayStart=Math.round(Math.random()*4000)+4000;
        this.t1=setTimeout(this.flFly,this.delayStart);
    }
    
    this.flFly=function (){
        if (_this.nr>_this.flipFlap) {
            _this.animate();
        } else {
            if (_this.wUp) {
                _this.nr++;
                _this.refObj.src=_this.modPic;
                _this.wUp=false;
                _this.t2=setTimeout(_this.flFly,100);
            } else {
                _this.refObj.src=_this.defPic;
                _this.wUp=true;
                _this.t2=setTimeout(_this.flFly,100);
            }
        }
    }
    
}

window.onload=function (){
    fluture1=new Fluture("fl1","images/fluturi/f90.png","images/fluturi/f90_m.png");
    fluture2=new Fluture("fl2","images/fluturi/f80.png","images/fluturi/f80_m.png");
    fluture3=new Fluture("fl3","images/fluturi/f70.png","images/fluturi/f70_m.png");
    fluture4=new Fluture("fl4","images/fluturi/f60.png","images/fluturi/f60_m.png");
    fluture5=new Fluture("fl5","images/fluturi/f50.png","images/fluturi/f50_m.png");

    fluture1.animate();
    fluture2.animate();
    fluture3.animate();
    fluture4.animate();
    fluture5.animate();
}