function getclass(obj,box){
	var adiv=obj.getelementsbytagname('*');
	var arr=[];
	for(var i=0;i<adiv.length;i++){
		if(adiv[i].classname==box){
			arr.push(adiv[i]);
		}
	}
	return arr;
}
function getstyle(obj,attribute){
	if(obj.currentstyle){
		return obj.currentstyle[attribute];
	}else{
		return getcomputedstyle(obj,false)[attribute];
	}
}
function startmove(obj,attribute,itarget){
	clearinterval(obj.timer);
	obj.timer=setinterval(function(){
		var icur=getstyle(obj,attribute);
		if(attribute=='opacity'){
			icur=parseint(parsefloat(icur)*100);
		}else{
			icur=parseint(icur);
		}
		var ispeed=(itarget-icur)/8;
		ispeed=ispeed>0?math.ceil(ispeed):math.floor(ispeed);
		if(icur==itarget){
			clearinterval(obj.timer);
		}else{
			if(attribute=='opacity'){
				obj.style.filter='alpha(opacity:'+(icur+ispeed)+')';
				obj.style.opacity=(icur+ispeed)/100;
			}else{
				obj.style[attribute]=icur+ispeed+'px';
			}
		}
	},30);
}