jQuery prevent change for select

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Try this:

http://jsfiddle.net/qk2Pc/

var my_condition = true;
var lastSel = $("#my_select option:selected");

$("#my_select").change(function(){
  if(my_condition)
  {
    lastSel.prop("selected", true);
  }
});

$("#my_select").click(function(){
    lastSel = $("#my_select option:selected");
});

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