It appears you may be importing only the URL portion of the code within your web page. For example, only inputting http://www.robot-workshop.com/client.js into your web page. You will need to enter the full code into your HTML editor to have the IDX display correctly. You can see an example of what you will need to enter below (Please note that this example will not work as it is ONLY an example):
This entire code does need to be entered into your HTML editor on your website so that it can be displayed properly. If it is not added into an HTML or ‘Code’ Editor, it will not display correctly on your web page, you will need to make sure you are not in a “Visual” or “WYSIWYG” (What You See Is What You Get) mode on your website editor, but specifically in an HTML or Code editor.
If the code in its entirety is not entered, the IDX installation will not work.