Need help with custom code in Joomla 1.5

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Javascript

PHP

Hey all,

I have recently taken over a website from someone written in Joomla 1.5. The problem I'm having is mostly adding my own custom code. How anyone can work with Joomla amazes me.

The problem I'm having is this. I have a javascript function that swops two images onmouseover event. This is working perfectly on the home page of the website since I added the javascript function to the index.php file op the template and the rest of the code to the images on the article. (I had to delete some of Joomla's code under libraries/joomla/filesystem I think in order to stop joomla from cleaning up my code)

Now I have another page which is not the home page. The source code shows that is has the javascript function in it but for some reason the images aren't changing. It keeps telling me that the file URL is invalid. All paths are valid and when I make this page my home page, it works fine.

So it seems like other pages (articles) does not correctly use the index.php file's head tags?? But then again the stylesheets should also not work?

I am completely lost with this as I am a pure PHP developer and do not have a lot of experience with Joomla.

Any and all help will be greatly appreciated,

Chris