function isNumeric(sText)
{
	var ValidChars = "0123456789.-";
	var IsNumber=true;
	var Char;
	// Hallotest - Nicholas
	for (var i = 0; i < sText.length && IsNumber == true; i++) 
	{ 
		Char = sText.charAt(i); 
		if (ValidChars.indexOf(Char) == -1) 
		{
			IsNumber = false;
		}
	}
   return IsNumber;   
}