this property is not supported by object?

$(document).ready(function(){
                ('#mainField').click(function(){
                    $("#editor").animate({width: 985, height: 200}, 1500);
                    $("#close开发者_开发知识库Editor").css("display", "inline");
                });
            });

This piece of code doesn't work, whats wrong?! It says: "this property is not supported by object" at the 2nd row..?

('#mainField')

404 No dollar found.