Latitude/longitude input control: an ASP.NET 2.0 server control

function NumericInputClass()
{
	function NumericInputKillExtraDigits(Val, Type, DecimalSeparator)
	{
		if(Type == 0)
			return(Val);
		if(Type == 1)
			return(Val);
		var DotPos = Val.indexOf(DecimalSeparator);
		if(DotPos == -1)
			return(Val+DecimalSeparator+"00");
		Val += "00";
		return(Val.slice(0, DotPos+3));
	}

	function FixData(This, Type, DecimalSeparator)
	{
		var Val = This.value;
		var NewVal = "";
		var GotDot = false;
		for(var i=0; i<Val.length; i++)
		{
			var c=Val.charAt(i);
			if(c == "-" && i == 0)
			{
				NewVal += c;
				continue;
			}
			// window.alert("new: '"+NewVal+"' c: '"+c+"'");
			if(c == DecimalSeparator)
			{
				if(Type == 0)
				{
					This.value = NewVal;
					return;
				}
				if(GotDot == true)
				{
					This.value = NumericInputKillExtraDigits(NewVal, Type, DecimalSeparator);
					return;
				}
				NewVal += c;
				GotDot = true;
				continue;
			}
			if(c >= '0' && c <= '9')
				NewVal += c;
		}
		This.value = NumericInputKillExtraDigits(NewVal, Type, DecimalSeparator);
	}
	this.FixData = FixData;
	
	function Check(Type, DecimalSeparator)
	{
		var Obj = event.srcElement;
		var Val = Obj.value;
		var Key = event.keyCode;
		var KeyAscii = String.fromCharCode(Key);
		if(KeyAscii == "-")
		{
			if(Obj.value != "")
			{
				event.returnValue = false;
				return;
			}
			return;
		}
		switch(Type)
		{
			case 0:		// integer
				if(KeyAscii < '0' || KeyAscii > '9')
				{
					event.returnValue = false;
					return;
				}
				return;

			case 1:		// Float
			case 2:		// Currency
				var DotPos = Val.indexOf(DecimalSeparator);
				if(KeyAscii == DecimalSeparator)
				{
					if( DotPos >= 0)
					{
						event.returnValue = false;
						return;
					}
					return;
				}
				if(KeyAscii < '0' || KeyAscii > '9')
				{
					event.returnValue = false;
					return;
				}
				return;
		}
	}
	this.Check = Check;
}
var NumericInput = new NumericInputClass();