var top_limit=260; 	
var timer = setTimeout("scroll_it()",1000);

function funcScrollDiv() {
	var scroll_top=self.pageYOffset || (document.documentElement && document.documentElement.scrollTop) || (document.body && document.body.scrollTop);
	$("#fly_div").animate({top: scroll_top}, 1000);
};

function scroll_it()
{
	clearTimeout(timer);
	timer = setTimeout("funcScrollDiv()",500);
};
	
window.onscroll = scroll_it;