I've some scripts in magento due to the confliction of the below, it is causing some glitch. I need to dig into the below scripts, so that I can find what is the causing the error. Where can I find the files of below code? getCssJsHtml() ?>

I've some scripts in magento due to the confliction of the below, it is causing some glitch. I need to dig into the below scripts, so that I can find what is the causing the error. Where can I find the files of below code?

<?php echo $this->getCssJsHtml() ?>