function MoveDiv(DivName) {
		var my_element = document.getElementById(DivName);
		var y = document.body.scrollTop;
		var height_max = document.getElementById('DualColumn').offsetHeight;
		var my_element_height = my_element.offsetHeight;
		var scroll_max = height_max - my_element_height;
		if ( (y < scroll_max) && ( y > 650 ) ) 	my_element.style.top = y - 50;
	}