onclick JavaScript button in image description not working in WordPress

Question

I am using and I want abutton below each image with an onclick JavaScript event, but it's not working if you insert it as an image description.

Why? It is working if it's inserted just in page, but not if in an image description. Here, only popup class='popmake-4415' works.

function reply_click(clicked_id)
{
    document.getElementById('mans').innerText = clicked_id;
}

Here 'mans' is the id for field in Contact form 7

<button class='popmake-4415' id="sarkans" onClick="reply_click(this.id)">B1</button>

I'm using Nexgen Gallery or GMedia gallery and Contact form 7 plugin with WordPress. Different images will have different id. Is it possible to somehow fix this?