How to hide a div using javascript

Question

I want to hide a div using Javascript. Below is my div.

Answer 1

Put it in document.ready():

$(function(){

 $(".ui-dialog-titlebar-close").css('display','none');

})

and you can also use hide():

$(function(){

     $(".ui-dialog-titlebar-close").hide();

})

FIDDLE EXAMPLE:

http://jsfiddle.net/qcfdLjr3/