Small bounty available for two snippets

I need two snippets of code. I unfortunately can only pay a total bounty of $100, since the site in question does not generate any income at this point.

Can anyone help me on these?

1) When a new session is started (authenticated or anonymous user) save into session data:

country
postal code
    I currently have this data available in variables, so they are accessible using get_variable i believe

lat
lng
    this can be determined with the above using some function in the location/gmap suite


- i just need to know what function to use to generate the lat/lng, and at what point at session startup to save the 4 items of data into the session data  

2) Define a block (which I can put onto any page I want) which shows the current session data from above. Country, selected from within a dropdown list of all countries, & the postal code, shown inside a text field, and a small search button. The block will likely be displayed at the top of the content area of my pages - so the country list, postal code, and search button should be able to horizotantally beside each other in less than about 300 pixels.

when the button is pressed:

- it computes the new lat/lng using the current contents of the dropdown & textfield 
- updates the session data and does a page refresh
- if there is a geocoding error when computing the lat/lng, it instead restores the fields to their current session values - no need of a page refresh 


- Here I really just need someone to write some php code I can put into a block definition, and to write the code to do the update when the button is pressed, and tell me where that updating code should go.

Thanks!

I can pay with PayPal