var pos = 0;
var sens=true;;
var increment = 1;
var timer;
var lungime=0;
var latime;
var inaltime=0;
var nr=0; // contorizeaza cilurile care le sta la margini
var sud="";

function start(IdImagine) {
    lungime=screen.availWidth-17; // ecranul util screen.availWidth-17
	sud=document.getElementById(IdImagine);
	latime=sud.width; // latimea originala a pozei
	inaltime=sud.height;
      sud.style.clip = "rect(0px "+lungime+"px auto 0px)"; 
	timer = setInterval("move()", 80);
}

function move() {
	pos += increment;
	if (pos >= latime-lungime) {
       nr++;
       if (nr > 53) {
    	   sens=!sens;
	       pos=0;
		   nr=0;
	   } else  pos-=increment;
	} else if (sens) {
              sud.style.left = -pos+"px";
              sud.style.clip = "rect(0px "+(lungime+pos)+"px auto "+0+"px)";
			} else {
              sud.style.left = lungime-latime+pos+"px";
              sud.style.clip = "rect(0px "+(latime-pos)+"px auto "+0+"px)";			
			}
	 
}