var browser_used=navigator.userAgent.toLowerCase(); 

var is_major = parseInt(navigator.appVersion); 
var is_minor = parseFloat(navigator.appVersion); 

var is_ie   = (browser_used.indexOf("msie") != -1); 
var is_mac    = (browser_used.indexOf("mac")!=-1);


var is_ie5  = (is_ie && (is_major == 4) && (browser_used.indexOf("msie 5.0")!=-1) );

var is_nav  = ((browser_used.indexOf('mozilla')!=-1) && (browser_used.indexOf('spoofer')==-1) 
                && (browser_used.indexOf('compatible') == -1) && (browser_used.indexOf('opera')==-1) 
                && (browser_used.indexOf('webtv')==-1)); 

if (is_mac)
        {
                // detect if ie5
                
                if(is_ie5)
                {                
                        document.write("<LINK REL=stylesheet HREF='includes/ie_onmac.css' TYPE='text/css'>");                 
                }
                else
                {
                        // if not load mac
                        document.write("<LINK REL=stylesheet HREF='includes/not_ie_onmac.css' TYPE='text/css'>");                                 
                }                
        }
        else
        {
                // if not mac then
        
                if(is_ie)
                {
                        // if ie5
                        document.write("<LINK REL=stylesheet HREF='includes/ie.css' TYPE='text/css'>");
                }
                else
                {
                        // else if netscape or opera
                        document.write("<LINK REL=stylesheet HREF='includes/not_ie.css' TYPE='text/css'>");
                }
                
                
        }


function NumOnly() {
	if (event.keyCode>='0'.charCodeAt()&&event.keyCode <= '9'.charCodeAt())
		event.returnValue = true;
	else
		event.returnValue = false;
}
function BlockSign() {
	// 33 - 47 ! " # $ % & ' ( ) * + , - . /
	// 58 - 64 : ; < = > ? @
	// 91 - 96 [ \ ] ^ _ `
	// 123 - 126 { | } ~
	if ((event.keyCode>32&&event.keyCode<48)||(event.keyCode>57&&event.keyCode<65)||(event.keyCode>90&&event.keyCode<97)||(event.keyCode>122 && event.keyCode<127))
		event.returnValue = false
}
function BlockQuote() {
	// 34 "
	// 39 '
	if (event.keyCode==34)
		event.returnValue = false
}
function BlockNum() {
	// 48 - 57 0 1 2 3 4 5 6 7 8 9
	if (event.keyCode>=48 && event.keyCode<=57)
		event.returnValue = false;
}










//----------------------------------------
// BrowserDetect sample:
//     alert(BrowserDetect.browser);
//     alert(BrowserDetect.version);
//     alert(BrowserDetect.OS);
//----------------------------------------

var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{
			string: navigator.userAgent,
			subString: "Chrome",
			identity: "Chrome"
		},
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();