Auto field update for Infopath in SharePoint

Refering to http://hermansberghem.blogspot.com/2011/03/trick-use-query-string-values-to.html, I am able to set the title of an InfoPath form using the Advance tab. So what I did was using my previous post of javascript snippets to get the element via Input tag and Title to set the field values.

As what the reference link has indicated, my internet explorer loads javascript before the infopath form, thus the text field did not exist while the javascript was running, I have used a polling method to wait half a second interval till the element loads.

Using infopath designer, the title is set to OccupationField

This snippet is similiar from previous javascript post except for a few tweaks.

The url will be something like http://url/page.aspx?Occupation=Policeman