function isNumberString(InString)
{
	if(InString.length==0) return (false);
	if(InString.indexOf(".") == 0) return (false);
	var RefString='1234567890';
	
	for (Count=0; Count < InString.length; Count++) 
	{
		TempChar= InString.substring (Count, Count+1);
		if (RefString.indexOf (TempChar, 0)==-1) return (false);
	}
	
	return (true);
}