function checkPlugin(plgIn, theURL, altURL, autoGo) {
	with (navigator) 
	if (appName.indexOf('Microsoft')!=-1 && appVersion.indexOf('Mac')==-1) 
		document.write(''+
		'<scr'+'ipt language="VBScript">\nOn error resume next\n'+
		'dir = IsObject(CreateObject("SWCtl.SWCtl.1"))\n'+
		'flash = NOT IsNull(CreateObject("ShockwaveFlash.ShockwaveFlash"))\n</scr'+'ipt>');
	
	var ok=false; document.returnValue = false;
	with (navigator) 
	if (appName.indexOf('Microsoft')==-1 || (plugins && plugins.length)) {
		ok=(plugins && plugins[plgIn]);
	} else if (appVersion.indexOf('3.1')==-1) { 
		//not Netscape or Win3.1
		if (plgIn.indexOf("Flash")!=-1 && window.flash!=null) ok=window.flash;
		else if (plgIn.indexOf("Director")!=-1 && window.dir!=null) ok=window.dir;
		else ok=autoGo; 
	}
	if (!ok) theURL=altURL; 
	if (theURL) window.location=theURL;
}