Thanks for your reply on the side bar.
However I can't find the way to resolve the image issue.
When i look in the page code here's what i see:
<img width="500" height="300" src="http://www.easy-chemistry.co.il/wp-content/uploads/2014/05/סרגל-PH.jpg" class="attachment-post-thumbnail wp-post-image" alt="סרגל pH" />
But the image is not display on the site: