function getStyle(obj,attr){

if (obj.currentStyle) {

return obj.currentStyle[attr];

}

else{

return getComputedStyle(obj,false)[attr];

}

}

function startMove(obj,attr,iTarget,fn){

clearInterval(obj.timer);

obj.timer =setInterval(function(){

var icur = 0;

if (attr =='opacity') {

icur = Math.round( parseFloat(getStyle(obj.attr))*100);

}

else{

icur = parseInt(getStyle(obj,attr));

}

var speed =(iTarget-icur)/8;

speed=speed>0?Math.ceil(speed):Math.floor(speed);

if (icur==iTarget) {

clearInterval(obj.timer);

if (fn) {

fn();

}

}

else{

if (attr=='opacity') {

obj.style.filter='alpha(opacity:'+(icur+speed)+')';

obj.style.opacity =(icur+speed)/100;

}

else{

obj.style[attr] =icur+speed+'px';

}

}

},30)

}