DOM with javascript?

[osho]

I wrote this script to extract the form number from DOM. It works in other js debuggers, but I don't know what I'm doing wrong with Zenno.

var pageSource = '{-Page.Dom-}';

var re = /<form[^>]*>/gim;
var match= {};
var counter = 0;
var formNumber = 0;
  while (match = re.exec(pageSource)) {
       if (match[0].indexOf('id="register"') !=-1) {
    formNumber = counter;
       }
      counter++;
  }

alert(formNumber);

How can I feed javascript the Page.Dom correctly?

 

[Hungry Bulldozer]

I'll check this JS as soon as I login to my machine with Zenno. But I guess you can do that in Zenno as well with a loop and action designer by changing match number with counter.