function chkNumeric(obj,msg) {
	var ValidChars = "0123456789.,";
	var Char;
	var sText;
	sText = obj.value;

	for (i = 0; i < sText.length; i++) 
	{ 
		Char = sText.charAt(i); 
		if (ValidChars.indexOf(Char) == -1) 
		{
			alert("You must provide a numeric value for " + msg);
			if(obj.type != 'hidden') obj.focus();
			return true;
	         }
	}
	return false;
}