script type text javascript document ready function upload_image ajaxF

<script type="text/javascript">
$(document).ready(function(){	
	$('#upload_image').ajaxForm({
	    dataType: 'json',
	    success: processJson
	    });
});
	
function processJson(data) { 
	    alert(data);
	    $('#mainn').html('');
	    $('#mainn').append('test');
	    $('#mainn').append(data);
	    
};

</script>