I have a radio element in a form and have created JS so that on change of the radio value the uploadLimit will change. IE premium member gets more image uploads.

I am setting a default uploadLimit in the uploadify set up and then changing it depending on the radio option selected. below is the JS file

$('#files').uploadify({
//set post
'method' : 'post',
// dont remove uploaded files
'removeCompleted' : false,
// dont automatically upload files
'auto' : false,
//max file size
//'fileSizeLimit' : '1MB',
// set upload limit
'uploadLimit' : 4,
'fileObjName' : 'listing_images',
//check for existing file names
'checkExisting' : '/uploadify/check-exists.php',        
'swf'  : '/uploadify/uploadify.swf',
        'uploader' : '/uploadify/uploadify.php',

});

$(document).ready(function() {


// on change of package radio
$('.package').change( function() {
//get label value to be used later
package = $(this).parents('label').text()

//if standard then display 4 image uploads. if premium them display all 10
if(package == 'standard') {
$('#files').uploadify('settings','uploadLimit','4');
} else if (package == 'premium') {
$('#files').uploadify('settings','uploadLimit','10');
}
});
});

I have also tried the settings method setting the final optional parameter to true and this didn't work either. e.g. below.
$('#files').uploadify('settings','uploadLimit','4', true);