gistfile1.txt

function ajaxStuff1(value){
  //do some ajax stuff with a value with a value parameter
}
 
function ajaxStuff2(value){
  //do some other ajax stuff with a value parameter
}
 
var doStuffWhenSelectIsChanged = function(theId, ajaxStuff){
  $(theId).change(function(){
    var theValue = $(theId).val();
    //do some ajax stuff with access to 'theValue' variable here.
    ajaxStuff(theValue)  
});
  
}
 
doStuffWhenSelectIsChanged('#lang1', ajaxStuff1)
doStuffWhenSelectIsChanged('#lang2', ajaxStuff2)