function InputNum() // by David NG
{
	var c = event.keyCode
	if( 
		c==8 || // back delete
		c==46 || // delete
		c==9 || // tab
		c==13 || // enter
		c==35 || // home
		c==36 || // end
		c==37 || // left arrow
		c==39 || // right arrow
		(c>=48&&c<=57) || // up key 0 to 9
		(c>=96&&c<=105) // num key 0 to 9
	)
		return true;
	return false;
}




function String.prototype.trim(){return this.replace(/(^\s*)|(\s*$)/g,"");} // by David NG




// clear all <select> -> <option>
function Clear_All_Select_Option( SelectObj ) // by David NG
{
	while( SelectObj.length > 0 )
		Clear_Select_Option( SelectObj, 0 );
}

// clear one <select> -> <option>
function Clear_Select_Option( SelectObj, index ) // by David NG
{
	if( BrowserObj.Is_Firefox || BrowserObj.Is_Firebird ) // for FireFox
		SelectObj.remove(index);
	else // default for IE
		SelectObj.options.remove(index);
}




/*
Browser Detecter 1.1
Written by David NG 
	@ TC Globalwork
	@ dwin.net
*/
function BrowserDetectClass()
{
	this.Agent           = navigator.userAgent.toLowerCase();
	this.appName         = navigator.appName.toLowerCase();
	this.RTPass          = false;
	this.Version         = 0;
	this.Gecko_Version   = 0;

	this.Is_Windows      = this.Agent.indexOf("window") != -1;
	this.Is_Linux        = this.Agent.indexOf("linux") != -1;
	this.Is_Mac          = this.Agent.indexOf("mac") != -1;

	this.Is_appFirefox   = this.appName.indexOf("firefox") != -1;
	this.Is_appNascape   = this.appName.indexOf("netscape") != -1;
	this.Is_appIE        = this.appName.indexOf("internet explorer") != -1;
	this.Is_appKonqueror = this.appName.indexOf("konqueror") != -1;

	this.Is_DHTML        = document.getElementById?true:false || document.all?true:false || document.layers?true:false;
	this.Is_DOM          = document.getElementById?true:false && document.createElement?true:false;

	this.Is_IE           = false;
	this.Is_Opera        = false;
	this.Is_Netscape     = false;
	this.Is_Firebird     = false;
	this.Is_Firefox      = false;
	this.Is_Mozilla      = false;
	this.Is_Konqueror    = false;
	this.Is_Gecko        = false;
	this.Is_HTMLEditor   = false;

	this.IE_PassVersion        = 4.01;
	this.Opera_PassVersion     = 7.21;
	this.Netscape_PassVersion  = 7.0;
	this.Firebird_PassVersion  = 0.6;
	this.Mozilla_PassVersion   = 1.6;
	this.Konqueror_PassVersion = 3.2;
	this.Gecko_PassVersion     = 20030312;
	this.IE_Editor_PassVersion = 5.5;



	if( this.Is_appIE )
	{
		this.Is_IE    = this.Agent.indexOf("msie") != -1;
		this.Is_Opera = this.Agent.indexOf("opera") != -1;
		if( this.Is_Opera )
			this.Version = GetVersion( "opera" );
		else
		{
			this.Version       = GetVersion( "msie" );
			this.Is_HTMLEditor = this.Version >= this.IE_Editor_PassVersion;
		}

		this.RTPass = ( ( this.Is_Opera && this.Version>=this.Opera_PassVersion ) || ( this.Is_IE && this.Version>=this.IE_PassVersion ) );
	}

	else if( this.Is_appNascape || this.Is_appFirefox )
	{
		this.Is_Netscape = this.Agent.indexOf("netscape") != -1;
		if( this.Is_Netscape )
			this.Version = GetVersion( "netscape" );

		this.Is_Firebird = this.Agent.indexOf("firebird") != -1;
		if( this.Is_Firebird )
			this.Version = GetVersion( "firebird" );

		this.Is_Firefox = this.Agent.indexOf("firefox") != -1;
		if( this.Is_Firefox )
			this.Version = GetVersion( "firefox" );

		this.Is_Mozilla = this.Agent.indexOf("debian") != -1;
		if( this.Is_Mozilla )
			this.Version = GetVersion( "debian" );

		this.RTPass = ( this.Is_Firefox || ( this.Is_Firebird && this.Version>=this.Firebird_PassVersion ) || ( this.Is_Netscape && this.Version>=this.Netscape_PassVersion ) || ( this.Is_Mozilla && this.Version>=this.Mozilla_PassVersion )  );

		this.Is_Gecko = this.Agent.indexOf("gecko") != -1;
		if( this.Is_Gecko )
		{
			this.Gecko_Version = GetVersion( "gecko" );
			this.RTPass = this.Is_HTMLEditor = this.Gecko_Version >= this.Gecko_PassVersion;
		}
	}

	else if( this.Is_appKonqueror )
	{
		this.Is_Konqueror = this.Agent.indexOf("konqueror") != -1;
		if( this.Is_Konqueror )
			this.Version = GetVersion( "konqueror" );

		this.RTPass = ( this.Is_Konqueror && this.Version>=this.Konqueror_PassVersion );
	}



	function GetVersion( str )
	{
		var iAgent     = navigator.userAgent.toLowerCase();
		var i          = iAgent.indexOf( str );
		var iLen       = iAgent.length;
		var iTemp      = 0;
		var iVersion   = "";

		for( ; i<iLen; i++ )
		{
			iTemp = iAgent.charAt(i);
			//if( ( iTemp>=0 && iTemp<=9 ) || ( iTemp=="." && iVersion.indexOf(".")==-1 ) )
			if( iTemp=="." && iVersion.indexOf(".")!=-1 )
				continue;
			if( ( iTemp>=0 && iTemp<=9 ) || iTemp=="." )
				iVersion += iTemp;
			else if( iVersion != "" )
				return iVersion;
		}
		return iVersion;
	}
}
var BrowserObj = new BrowserDetectClass();