TimeoutSECOND = 1;
step=10;
function slider(obj_id){
	obj=document.getElementById(obj_id);
	obj.style.overflow = 'hidden';
	if (!obj.style.height){
		obj.objHeight = parseInt(obj.offsetHeight);
	}else{
		obj.objHeight = parseInt(obj.style.height);
	}
	if (obj.style.display=='none'){
		//
		obj.style.display = 'block';
		pre_objHeight =  parseInt(obj.offsetHeight);
		obj.style.height= 'auto';
		obj.maxHeight = parseInt(obj.offsetHeight);
		obj.style.height = pre_objHeight;
		//
		open_obj(obj);
	}else{
		close_obj(obj);
	}
}
function open_obj(obj){
		var mystep = (obj.maxHeight / step);
		objHeight = obj.objHeight + step;
		obj.style.height = objHeight + 'px'; 
		obj.objHeight = objHeight;
		if (parseInt(obj.style.height) < obj.maxHeight){
			var myTime=setTimeout(function(){open_obj(obj)}, TimeoutSECOND);
		}else{
			obj.style.height= '';
		}
}
function close_obj(obj){
		objHeight = obj.objHeight - step;
		if (objHeight > 0){
			obj.style.height = objHeight + 'px'; 
			obj.objHeight = objHeight;
			var myTime=setTimeout(function(){close_obj(obj)}, TimeoutSECOND);
		}else{
			obj.style.height= '';
			obj.style.display ='none';
			obj.objHeight = 0;
		}
}