Jquery disable plugin

// Common JQuery helper methods
// Author wtrocki@gmail.com

/**
 * Mark element as disabled.
 * Note: this method is not removing custom events connected to element.
 *
 * @param disabled boolean - true if element should be disabled
 * @returns {$}
 */
$.fn.disableElement = function (disabled){
  if (disabled){
    // Compatible with XHTML and HTML5
    this.attr("disabled", true);
  } else{
    this.removeAttr('disabled');
  }
  return this;
};

/**
 * Get element disabled state
 *
 * returns true if element is disabled, false otherwise
 */
$.fn.isDisabled = function (){
  return !!this.attr("disabled");
}