var height;
var x = 0;

function getTableHeight()
{
	height = $("tabel_calificative").getHeight() - 134;
	move = setTimeout("moveTable()", 50);
	$("frame_3").style.display = "none";
}

function moveTable()
{
	if(x > -height)
	{
		x -= 1;
	}
	else
	{
		x = 0;
	}
	$("tabel_calificative").style.top = x + "px";
	move = setTimeout("moveTable()", 50);
}

addEvent(window,'load', getTableHeight, false);