Make javascript form POST variables to 2 URL's

We currently have a Javascript form which POSTS a dozen or so form fields to a 3rd party URL. The posting string looks like this (example): [login to view URL] The variables are populated by the webform. What we need to do is in addition to posting to the above original third-party URL, we need to also post to a second URL on form submit. In other words, on form submit data would post like this [login to view URL] [login to view URL] Please note the second, new URL we're posting to is a hidden/quiet post, the user doesn't know and doesn't get redirected anywhere. The second requirement is we would ideally like to have the second, new URL we're posting to be called into the existing .js page. In other words, we don't want all the new code on the existing .js page, we'd like it on a separate .js page. This way we can just comment out the 1-2 lines on the existing .js script that calls in this new script if we need to. The third requirement is the coder must add some hidden fields to our existing webform. These fields must be dynamically populated. The fields are: Current Date/Time URL User IP **Code must be clean and work on all modern browsers. Winning coder will be supplied with all necessary files. ** Thanks for looking!