Java script help for popup dialog boxes

hi, have been trying create popup dialog box tell users fill in form fields. don't know java have been using script found in forums, need able modify text. can tell me how this? here script. thanks.

 

var requiredfields = [], error = "";

for (var = 0; < numfields; i++) {

    var fname = getnthfieldname(i);

    var f = getfield(fname);

    if (f.type !== "button" && f.required && !f.valueasstring) {

        requiredfields.push(fname);

        error += fname + "\r";

    }

}

if (error) {

    app.alert("please complete following fields: \r\r" + error, 3);

    getfield(requiredfields[0]);

} else {

}

what text want modify, exactly?

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