Output to form

Hi All,

I would like the following code snippet to display its result on a text box on my form.

if (global.count == null) {
global.count = 1000000
global.setPersistent("count",true)
}
else
global.count++
var f = this.getField("jobCount")
f.value = global.count


I am using acrobat professional 9.0.0 and the Advanced>Document processing>Document JavaScript as well as the Edit All JavaScript options are disabled (grayed out).

Could I please have a list of steps, if the above objective is achievable....THANKS!!!!