How to disable jQuery UI tab(s)

Single tab

$( "#tabs" ).tabs( "option", "disabled", 1);

Multiple tabs

$( "#tabs" ).tabs('option','disabled', [1, 2, 3, 4]);

An entry with the same key already exists.

Causes:

• Multiple asp net controls with same ID
• Mostly occurs inside ListView control 
• Try using different ID's for control in insertitem template and edititemtemplate.
• or just hide insertitemtemplate when edititemtemplate is active.
• Keep an eye on validator controls. Try to have different id on master and child pages.

Change an Image while using JCrop

Initialize jCrop

var jcrop_api;
        function InitjCrop() {
            $('#id').Jcrop({  }, function () {
                jcrop_api = this;
            });
        }

To unhook jCrop

jcrop_api.destroy();

To Hook jCrop again

InitjCrop();