function refreshForecast()
{
	l=forecast_td.length;
	_scroll_left=document.getElementById("forecast_left");
	_scroll_right=document.getElementById("forecast_right");


	if(fore_first<=0) 
		_scroll_left.style.display="none";
	else 
		_scroll_left.style.display="";
		

	if(fore_first>=l-4)
		_scroll_right.style.display="none";
	else 
		_scroll_right.style.display="";


	for(i=0;i<l;i++)
		forecast_td[i].style.display="none";

	for(i=fore_first;i<fore_first+4;i++)
		if(forecast_td[i])
			forecast_td[i].style.display="";

}

function weatherScroll(offset)
{
	fore_first+=offset;
	refreshForecast();
}