function menuMove() 		{
	var s_top = document.body.scrollTop;
	var top = document.getElementById('divMenu').style.top;
	
	top_length = 180;
	
	if (s_top > top_length)	{
	  var final_top = parseInt(s_top) - parseInt(top_length);
	  var c_top = parseInt(document.getElementById('divMenu').style.top);
	
	  if(c_top < (final_top - 30)) c_top = final_top - 30;
	
	  c_top++;
	
	  if (c_top > final_top)
		  c_top = final_top;
	
	  document.getElementById('divMenu').style.top = c_top + 'px';
	}
	else if (s_top <= top_length)
	{
	  document.getElementById('divMenu').style.top = '0px';
	}
	
	setTimeout('menuMove()', 5);
}