var kbTop = 0;

function scrollKb ()
{
	var kb = document.getElementById('kb');
	if (window.innerHeight)
	{
		yOffset = window.pageYOffset;
	}
	else if (document.documentElement && document.documentElement.scrollTop)
	{
		yOffset = document.documentElement.scrollTop;
	}
	else if (document.body)
	{
		 yOffset = document.body.scrollTop;
	}
	if (yOffset == kbTop)
	{
		kb.style.top = yOffset +'px';
		kb.style.display = 'block';
	} else {
		kb.style.display = 'none';
	}
	kbTop = yOffset;
	temp = setTimeout('scrollKb()',500);
}