function alignLeft(id, num)
{
var l = $('#' + id);
var left = l.position();
var left = position.left - (num / 2);
return left;
}
function alignTop(id, num)
{
var t = $('#' + id);
var top = t.position();
var top = position.top - (num / 2);
return top;
}

I get position is not defined