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