Read data from from when tab to element, get data from php script reutrn data

[Hardwarez]

Ok, I need to read data from a from text field when the user tabs or clicks out of the box then I need to submit that data to a php page and get two returned values from that page then I need to take that data and fill in two of the text fields in the form automatically.

 

Can anyone tell me how to use java script to do this?

 

Example of what  I want to happen:

User enters name then tabs or clicks to next element in form.  Script reads first field then calls php, which searches database for that name.  If that name is found the php page will return two other strings like address and phone number. The java script needs to automatically fill in the two text fields, address and phone in the form IF data is returned.