Estoy buscando un Combobox que no pueda ser modificado

[rodojpm]

Bueno, si alguien esta buscando algo parecido, aquí les tengo un script que acabo de crear:http://jsfiddle.net/6Tt2N/8/

html

Código HTML:

<select name="categories" class="category">
    <option value="none">no category</option>
    <option value="1">general</option>
    <option value="2">technology</option>
    <option value="3">medicine</option>
    <option value="4">economic</option>
</select> 

javascript (usando jquery)

Código PHP:

  /* detecting the changes*/
var selector = ".category";
$("select" + selector).change(function () {
    $("#write_sel").trigger("click");
    $("#write_sel").val($(selector + " option:selected").text());
    $(selector + " option:selected").text("");
    $("#write_sel").css("opacity", 1);
});

/*Create the selector input field*/
$("select" + selector).parent().append("<input type='text' name='new' id='write_sel' placeholder=''>");
var position = $("select" + selector).position();
$("#write_sel").css("width", $("select" + selector).width() - 20);
$("#write_sel").css("height", $("select" + selector).height());
$("#write_sel").css("padding", $("select" + selector).css("padding"));
$("#write_sel").css("position", "absolute");
$("#write_sel").css("top", position.top + 1);
$("#write_sel").css("left", position.left + 1);
$("#write_sel").css("background", "transparent");
$("#write_sel").css("font-size", $("select" + selector).css("font-size"));
$("#write_sel").css("padding-left", "7px");
$("#write_sel").css("border", "0");
$("#write_sel").css("outline", "none");
$("#write_sel").attr("placeholder", $(selector + " option").first().text());
$(selector + " option").first().text("");
//console.log($(selector + " option").first().text());

/*Making sure the editor is only activated when double clicking*/
var DELAY = 200,
    clicks = 0,
    timer = null;
$("#write_sel").click(function (e) {
    //    if()
    if ($(selector + " option:selected").val() != $("select" + selector + " option").first().val()) {
        clicks++; //count clicks
        if (clicks === 1) {
            timer = setTimeout(function () {
                $("#write_sel").blur(); //do nothing
                clicks = 0; //after action performed, reset counter
            }, DELAY);
        } else {
            clearTimeout(timer); //prevent single-click action
            $(selector + " option:selected").text("");
            $(this).css("opacity", 1);
            clicks = 0; //after action performed, reset counter

        }
    }
}).dblclick(function (e) {
    e.preventDefault(); //cancel system double-click event
});

/*Returning the variable to the corresponding option*/
$("#write_sel").blur(function () {
    $(selector + " option:selected").text($(this).val());
    if ($(this).val() != '') {
        $(this).css("opacity", 0);
    }
}); 
   

css

Código:

category {
    width:200px;
}
::-webkit-input-placeholder {
    /* WebKit browsers */
    color: #555;
}
:-moz-placeholder {
    /* Mozilla Firefox 4 to 18 */
    color: #555;
}
::-moz-placeholder {
    /* Mozilla Firefox 19+ */
    color: #555;
}
:-ms-input-placeholder {
    /* Internet Explorer 10+ */
    color: #555;
}