I need to null the value in text box on click, currently I have written a code as such

  <div class="keyword_non">
                        <h1>Keywords : <a class="someClass question_off" title="Keywords "></a></h1>
                        <h2><input type="text" name="kw1" value="one" /></h2>
                        <h2><input type="text" name="kw2" value="two" /></h2>
                        <h2><input type="text" name="kw3" value="three" /></h2>
                        <h2><input type="text" name="kw4" value="four" /></h2>

                    </div>
<script type="text/javascript" src="/functions/javascript/custom/non_profit_edit.js"></script>
<script type="text/javascript" src="/functions/javascript/jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="/functions/javascript/custom/jquery-ui-1.8.7.custom.min.js"></script>

Inside non_profit_edit.js i have written as such

    $(document).ready(function(){

    $(".kw1").click(function() { 
    $(".kw1").val(" ");          
    });

    $(".kw2").click(function() { 
    $(".kw2").val(" ");          
    });

    $(".kw3").click(function() { 
    $(".kw3").val(" ");          
    });

    $(".kw4").click(function() { 
    $(".kw4").val(" ");          
    });

});

But write now its not working properly... Is this any browser issues or error in code..