/*
NAGIVATEURS SUPPORTES
firefox 1+, netscape 7+
 mac: safari, ie
 pc: ie 5.5+
*/

/*
function checkBrowser()	{
    var agent = navigator.userAgent.toLowerCase();
    
    
    if((agent.indexOf("msie 6")==-1) && (agent.indexOf("msie 7")==-1)) {
	alert("Vous devez utiliser un navigateur Internet Explorer 6 au minimum.");
	return false;
    }
	if (checkIt('linux')) OS = "Linux";
	else if (checkIt('x11')) OS = "Unix";
	else if (checkIt('mac')) OS = "Mac"
	else if (checkIt('win')) OS = "Windows"
	else OS = "an unknown operating system";

	return true;
}


*/


function checkIt(string)
{
    var agent = navigator.userAgent.toLowerCase();
	place = agent.indexOf(string) + 1;
	thestring = string;
	return place;
}
function navigateur_autorise()
{
	var detect = navigator.userAgent.toLowerCase();
	var OS,browser,version,total,thestring;

	if (checkIt('konqueror'))
	{
		browser = "Konqueror";
		OS = "Linux";
	}
	else if (checkIt('firefox')) browser = "Firefox"
	else if (checkIt('safari')) browser = "Safari"
	else if (checkIt('omniweb')) browser = "OmniWeb"
	else if (checkIt('opera')) browser = "Opera"
	else if (checkIt('webtv')) browser = "WebTV";
	else if (checkIt('icab')) browser = "iCab"
	else if (checkIt('msie')) browser = "Internet Explorer"
	else if (!checkIt('compatible'))
	{
		browser = "Netscape Navigator"
	}
	else browser = "An unknown browser";

	if (!OS)
	{
		if (checkIt('linux')) OS = "Linux";
		else if (checkIt('x11')) OS = "Unix";
		else if (checkIt('mac')) OS = "Mac"
		else if (checkIt('win')) OS = "Windows"
		else OS = "an unknown operating system";
	}
	if(browser=="Firefox") // FireFox toutes plateformes
	{
		version=detect.substring(checkIt('firefox')+7,checkIt('firefox')+10);
		if(version>="1.0")
			return true;
	}
	
	if(browser=="Netscape Navigator") // Netscape 7+ toutes plateformes
	{
		version=detect.substring(checkIt('netscape')+8,checkIt('netscape')+11);
		if(version>="7")
			return true;
	}


	if (OS=="Mac")
	{
		if (browser=="Safari") 
			return true;
	}
	else if (OS=="Windows")
	{
		if (browser=="Internet Explorer")
		{
			version=detect.substring(30,33);
			if (version>="5.5")
				return true;
		}
	}


	return false;

}
function testenav()
{
if(!navigateur_autorise())
	alert("Your browser is not supported. You must use one of the following browsers:\n- Windows: Internet Explorer 5.5 or newer, Netscape 7 or newer, Firefox 1 or newer.\n- Mac OS : Safari, Firefox 1 or newer\n- Linux : Netscape 7 or newer, Firefox 1 or newer.");
}