var min =  270;
  var min2 = min - 0;
  var max = 0;
  function left_move_init() {
    if( typeof( document.getElementById('left_menu') ) != 'undefined' ) 
	{	
		itm = document.getElementById('left_menu');
		itm.set_pos = function(y){itm.style.top=y;};
		itm.y = min;
		itm.set_pos(itm.y);
		//alert( itm.scrollHeight );
		max = document.body.scrollHeight - itm.scrollHeight - min;
	}
	setTimeout('left_move_func()', 10);
  }
  function left_move_func() {
    tmp = document.body.scrollTop + min;
    itm.y += Math.floor((tmp-itm.y)/10);

    if( itm.y>max ) itm.y = max;
    if( itm.y<min ) itm.y = min;
    itm.set_pos(itm.y);
    setTimeout('left_move_func()', 10);
  }
  setTimeout('left_move_init()', 1000);