function startMove(obj,goal){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var speed=(goal-obj.offsetWidth)/8
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if (goal==obj.offsetWidth) {
clearInterval(obj.timer);}
else{obj.style.width=obj.offsetWidth+speed+'px';}
},30)}
