var fDesc=new Array();
fDesc[0] = "This viewer is designed to process Grib marine weather forecasts which are readily and freely available over the Internet. These files are compressed so can be downloaded quickly, even over slow internet connections (e.g. mobile or sat phones) and typically contain wind speed and direction information at 3, 6 or 12 hourly intervals for 3 to 7 days. Values are normally given for each degree of latitude and 1.25 degrees of longitude. Those provided by the Raymarine Corporation also include pressure at msl, air temperature and precipitation. The system also includes utilities to download files, extract specific data, join files and to decompress files downloaded in zip or bzip format.";

function tShowHide(id, show)
{
	var s = document.getElementById("desc");

	if ((s.innerHTML.length<=212 || show==1) && show!=2)
	{
		s.innerHTML = fDesc[id];
		if (document.getElementById('m1'))
			document.getElementById('m1').style.display='none';
		if (document.getElementById('m2'))
			document.getElementById('m2').style.display='none';
		if (document.getElementById('more_txt'))
			document.getElementById('more_txt').style.display='inline';
	}
	else
	{
		s.innerHTML = '';
	}
}