need source value with using change() function

need source value with using change() function

Hi freinds I want to change image src on change in fileField my code is
mentioned below
HTML
<input type="file" name="fileField" id="fileFieldVoice"><br/><br/>
<p>Upload your own voice file
here only mp3, wav, Max. 4MB</p>
<p>&nbsp;</p>
<p class="center clk"><a href="#"><img
src="images/uploadDisable.png" alt=" "
width="78" height="37" ></a></p>
Script
$('#fileFieldVoice').on('change',function(){
var fileField = 'images/uploadActive.png'
/*alert(fileField)*/
$('.clk').children('img').attr('src').val(fileField);
})
You can also see fiddle here http://jsfiddle.net/QPry4/