function CheckNumber(input,obj)   //-----INPUT=DATA FIELD --- OBJ=FORM
{
	var msg = input.name + " field had invalid data: " + input.value;
	var msgswitch = "0";
	var msgdecimalswitch = "0";
	var str = input.value;
	for (var i = 0; i < str.length; i++) 
		{
		var ch = str.substring(i, i + 1);
		if ((ch < "0" || "9" < ch) && ch != '.') 
			{
			msgswitch = "1";
			}
		if (ch == ".")
			{
			msgdecimalswitch++;
			}
		}
	var ch = str.substring(0,1);
	if ((ch == '-')) 
		{	
		msgswitch = "0";
		}

	if (msgswitch == "1" || msgdecimalswitch > 1)
		{
		input.value="";
		alert(msg);
		obj.FeedbackMessage.value=msg;
		input.focus();
		}

}