Module development and code questions

Please take a look here....
http://drupal.org/node/111981

Can I create own module for work with po-files. E.g. if add function _t() for translate, may be conflict with drupal i18n module?

I've setup adsense module correctly, but when I view it in html source, it's only show something like:

<!--adsense: placeholder-->
<div style=" width:120px; height:240px; border:solid 1px">Google AdSense</div>

any ideas what's wrong?
thanks

I'd like to modify a module to send e-mail. Is there an e-mail function on Drupal core I could either a) use b) copy and modify?

e.g.: send_email($recipient, $sender, $title, $body)

Thanks for any recommendations.

I am working on a module that would allow nodes to be set as unpublished based on a user entered value.

For example the user is setting a duration of 10. I need to get the current time, add ten (from the user), then save into my db into pm_field_item_close_date 9which I already have within my node_item table. I am trying to do this when the user creates the node so I thought I should use the hook_insert.

Here is my function:

Hi,

I want to be able to enter a list of items and have users give the items monetary values. I want each item to display the average of these given values. Each user should only be able to assign one value to each item.

Is there a module that will allow me to do this?

Thanks,
Brian
ebayfirefly@comcast.net