function isDownBrowser(){
	var browser = 'an unknown browser';
	var platform = 'an unknown platform';
	var u = navigator.userAgent;
	var i = u.indexOf('WebTV');
	if(i >= 0) { browser = 'WebTV'; i += 6; }
	else {
		i = u.indexOf('MSIE');
		if (i >= 0) { browser = 'Internet Explorer'; i += 5; }
		else {
			i = u.indexOf('Opera');
			if (i >= 0) { browser = 'Opera'; i = u.indexOf(') ') + 2; }
			else {
				i = u.indexOf('Mozilla/');
				if (i >= 0) { browser = 'Netscape'; i += 8; }
			}
		}
	}
	version = parseFloat(u.substring(i, i+4));
	if (u.indexOf('Win') >= 0) {
		platform = 'Windows';
		if(u.indexOf('95') >= 0) platform+=" 95";
		else if(u.indexOf('98') >= 0) platform+=" 98";
		else if(u.indexOf('2000') >= 0) platform+=" 2000";
		else if(u.indexOf('NT') >= 0) platform+=" NT";
	}
	if (u.indexOf('Mac') >= 0) { platform = 'Macintosh'; }
	if (u.indexOf('OS/2') >= 0) { platform = 'OS/2'; }
	if (u.indexOf('X11') >= 0) { platform = 'UNIX'; }
	if (u.indexOf('Linux') >= 0) { platform = 'Linux'; }
	if(browser=="Netscape" && version>=5) version=6;
	
	//alert(u);
	//alert(version);

	if(navigator.userAgent.toLowerCase().indexOf('mac') != -1 ){
		//Macs are JavaScript challenged!
		return true;
	}else if(navigator.userAgent.toLowerCase().indexOf('opera') != -1 ){
		//Opera
		return true;
	}else if(document.all && version < 5.5){
		//IE - older versions 
		return true;	
	}else if(document.all){
		//IE
		return false;
	}else{
		//Other browsers which are also JavaScript challenged!
		return true;
	}
}

function isIE6up(){
    if(navigator.appVersion.indexOf("MSIE 6") > 0){
        return true;
    }else if (navigator.appVersion.indexOf("MSIE 7") > 0){
        return true;
    }else if (navigator.appVersion.indexOf("MSIE 8") > 0){
        return true;
    }else{
        return false;
    }
}

function isSafari(){
    var u = navigator.userAgent;
    var i = u.indexOf('Safari');
    if (i >= 0){
        return true;
    }else{
        return false;
    }
}