Acrobat8 and javascript...need help

[EricaB]

Hello,

I'm working on a form in Acrobat 8. On page one the user enters all their contact info and their age. On page 5 I have a section that tells them what their heart rate should be at/around. I would like this to automatically fill when their enter in their age in the beginning. So I created a text field next to the heart rate copy and under the Calculate tab I entered this javascript:
var n = "220";
var a = this.getField(age);
var p = ".5";
var s = "6";
function heartrate()
{
var hr = n - a * p / s;
document.write ("+hr+");
}
I'm not getting any errors, but also, nothing is calculating, my field is blank. Am I missing something?? The field that the user types in their age is called age.

The calulation my client uses to figure out the heart rate is as follows:
220 - age=Y then take 50,60,70,80, and 90 of Y, then divide each by 6

HELP!!!
Erica

 

[EricaB]

I figured it out...I was doing it the hard way and by using the Simplified field notation I was able to make it work. I swear I tried that before and it didn't work.
(220 - age)*0.5/6

Thank you,
Erica