Insert Script Object?

Question

In Acrobat Pro you can create a document script as follows:
function Hello()
app.alert("Hello World")
And call this Hello.
If you create button on the page then create an action on Mouse Up Run a JavaScript which looks like this:
Hello();
A message box appears saying Hello World click OK and press the button and it keeps coming back.
Now in Designer this is a little different.
I create a new page, insert a script object rename it to Hello and type:
function Hello()
app.alert("Hello World")
I then create a button and on the mouse up action type;
Hello();
If I try this I get the following mesaage:
TypeError: Hello is not a function
1:XFA:form1[0]:#subform[0]:Button1[0]:mouseUp
Why is it so?
Even removing the script object and going to the Form properties Variables tab and entering the function script there does not seem to work.

Answer 1

Thanks Steve,
It works without a hitch. Im still getting my head around JavaScript and 2 weeks, 6 hours a day of reading and testing and reading is slowly getting clearer I think.
Just to make sure Im getting this clear in my head. The way I had the script before was when it was applied to the field that showed the value it was referring to this as the field itself. So it worked not worries because it was point to the itself.
When I tried to apply the same script in a script object field (variables) that the whole documents can reference it was only in as a variable. The line form1.variables.setTotals.Totals(); did not do anything because it did not see the totals as a function and refer to it, and as a result nothing would appear in the filed. By adding obj to the script it tells the form that its an object and the objects formula is spei1 + spei2. This now means that the script can be applied to any filed and that is where form1.variables.setTotals.Totals(this); comes in. It tells the filed apply the object (Totals [spei1 + spei2] ) to this filed.
Does this mean that any script placed in the Variables field needs to be referred to as objects?
The reason I was taking this approach was to resolve a problem posted earlier.
I thought by having the script as a script object that was applied to the document rather than the field it would update the other fields that refer to it. Which I now realize will not happen. Could you suggest a conditional statement that I could put in to:
If special item 1 = $12.00 the result in the total = $12.00. If I then click on one of the fields in the special column say in Monday for example the result should be $12.00. If I then decide to enter another $12.00 in special item 2 the total will now be $24.00 but the Monday result will still say $12.00.
Is there a way to have it check that it the figure which may appear in the Special column, to update that result as well?
Should I be look at a message box instead telling the user there is a difference and for them to re-click on the Monday field to update it?
Any suggestions would be appreciated.
Regards, John.