$(function(){

  var select1 = $('select[name="select1"]');
  var select2 = $('select[name="select2"]');
  var text = $('input[name="name"]');

  function selectChange(){
    var str1 = select1.val();
    var str2 = select2.val();
    text.val(str1+" "+str2);
  }

  select1.change(function(){selectChange();});
  select2.change(function(){selectChange();});
  selectChange();
});