search textbox related

Question

i hsve s written a code where in a textbox when i enter any alphabet particular emplyee list shows down with its user id also with it 

 

for eg if i type "su" in textbox it shows up name starting with su if i select my name from the list it will take my name as well as my user id also 

 

on a search button i want to show the projects related to the employee "subin"

 

the project will be called using userid but the name of the employee is in different table andi want to search project by the name  

 

how wil i do ?

 

thanks