To use more show/hide in one page you have to change the name of the div. for example use: "Hiddendiv1","Hiddendiv2" and so on. There are only 2 places you need to change this in the code.
How to embed Youtube videos in your page - Show/Hide
When you locate a video you'd like to add to your page on YouTube, look below the video for a Share button. When you click the Share button, the HTML code used to embed a link that video is displayed directly below it, however that's not what we are after, we want to directly embed the video into the page. We do that by clicking the Embed button which is displayed directly below the Link URL. Once you click the Embed button, you will see the HTML code for embedding the video. It will look something like this: After making your selection, copy and paste the embed code above. The code changes based on your selection. You can also change the size of the video by editing the pixel width and height, in this example 315px x 560px