var version = navigator.appVersion;
var versNum = parseFloat(version);
var browser = navigator.appName;
var itsOK = false;
var isNav = false;
var isNav6 = false;
var isNav4 = false;
var isIE = false;

if (browser == "Netscape") 
{
	if (versNum < 3) 
	{
		itsOK = false;	
		isNav = true;
	} 
		else if (versNum < 4) 
			 {
			 	 itsOK = false;
				 isNav = true;
			 } 
			else if (versNum >= 5) 
				 {
					 isNav6 = true;
					 itsOK = true;
				 } 
				else 
					{
						if (versNum>=4 && versNum<5) 
						{
							isNav4=true;
						}
						itsOK = true;	
						isNav = true;
					}
} 
	else if (browser.indexOf("Microsoft") > -1) 
	{
		isIE = true;
		if (versNum < 4.0) 
		{
			itsOK = false;
		} 
			else 
			{
				itsOK = true;
			}
		if (navigator.platform == "MacPPC") 
		{
			itsOK = false;
		}
     }