function trim(sString)
{
	while (sString.substring(0,1) == ' ')
		sString = sString.substring(1, sString.length);
	while (sString.substring(sString.length-1, sString.length) == ' ')
		sString = sString.substring(0,sString.length-1);
	return sString;
}

function getcss()
{
	browser_version = parseInt(navigator.appVersion);
	browser_type = navigator.appName;
	if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) 
	{
		document.write("<link rel='stylesheet' HREF='iestyle.css' TYPE='text/css'>");
	}
	else 
	{
		document.write("<link rel='stylesheet' HREF='style.css' TYPE='text/css'>");
	}
}

function validate()
{
	$invalid = false;
	
	if (trim(document.getElementById('details').value) == '')
		$invalid = true;
	
	document.getElementById('go').disabled = $invalid;	
}