function getbyclass(aparent,sclass)
{
	var aele=aparent.getelementsbytagname('*');
	var aresult=[];
	for(var i=0;i<aele.length;i++)
	{
		if(aele[i].classname==sclass)
		{
			aresult.push(aele[i])	
		}
	}
	return aresult;
}
function getstyle(obj,name)
{
	if(obj.currentstyle)
	{
		return obj.currentstyle[name];	
	}
	else
	{
		return getcomputedstyle(obj,false)[name];	
	}
}
function startmove(obj,attr,itarget,fnend)
{
	clearinterval(obj.timer);
	obj.timer=setinterval(function(){
		var cur=0;
		if(attr=='opacity')
		{
			cur=math.round((getstyle(obj,attr))*100);	
		}
		else
		{
			cur=parseint(getstyle(obj,attr))	
		}
		var speed=(itarget-cur)/7;
		speed=speed>0?math.ceil(speed):math.floor(speed);
		if(cur==itarget)
		{
			clearinterval(obj.timer);
			if(fnend)fnend();
		}
		else
		{	
			if(attr=='opacity')
			{
				obj.style.filter='alpha(opacity:'+(cur+speed)+')';
				obj.style.opacity=(cur+speed)/100;	
			}
			else
			{
				obj.style[attr]=cur+speed+'px';
			}
		}
	},30)	
}