Uploadify open browse dialog when click on a custom picture

I am using Uploadify to upload pictures.

I am having a picture, and I want to Uploadify open the browse files dialog after clicking on the image, how can I achieve this ?

Here is my code

$("#btnAddImg").click(function() {
     Uploading(); 
 });
 
 function Uploading() {
 
     var a = $("input#Id").val();
 
     alert("uploading" + a);
 
     $("#fileuploader").uploadify({
         'uploader': '/Scripts/uploadify/uploadify.swf',
         'cancelImg': '/Content/Images/icones/cancel.png',
         //'buttonText': 'Select Image',
         //'buttonImg': '/Content/Images/icones/picture-add-icon.png',
         'script': 'Home/Upload',
         'folder': a,
         'fileDesc': 'Image Files',
         'fileExt': '*.jpg;*.jpeg;*.gif;*.png',
         'multi': true,
         'auto': true
     });
 }
 

Ps: I don' t want to use the 'buttonImg': integrate property, as I want uploadify to load only after clicking my custom image ( as behind the scene I want to get the dynamic folder path and pass to uploadify)

---