Simple JQuery script working on JSFiddle, not on my site

Question

I\'m trying to get the original width of an image with JQuery and make some adjustments in the CSS with a condition if an image is wider than 700px.

I used this code

Answer 1

Use the jQuery document ready function like this:

$(document).ready(function(){

});

This is a common "bug" with code that is copied from jsFiddles.