/**
 * Pass an option hash as an argument to our function, and extend the jQuery object.
 * This is an example of how to extend the jQuery object.
 */
(function($){
	$.fn.setReadOnly = function(readonly,ourOptions){
		var options = $.extend({
			read: 1.0,
			readOnly: 0.5
		},ourOptions||{});
		return this.filter('input:text').attr('readonly',readonly).css('opacity', readonly ? options.readOnly:options.read);
	};
})(jQuery);

$(function(){
	$('#same').click(function(){
		var same = this.checked;
		$('#details2 input').setReadOnly(same,{readOnly: 0.1});
	});
});

An example of how to extent the jQuery objects to include our own methods.

jQuery Object Hash and jQuery Extend

jquery

JavaScript