Doc With Editable Areas

I have searched high and low and cannot find any information that I can use. I use HTML often for my website and need to find a way to create a document with the fixed info being set and only certain areas that I can edit.

Here’s an example (the _____ is the only area I want to be able to input information, and then be able to copy all of it – kind of like a form style):
<td>
<p align=”center”><img src=”https://__________________________.jpg&#8221; alt=”Facebook” width=”90″ height=”90″ border=”0″ /></p></td>
<td>
<p align=”center”><img src=”https://________________________.jpg&#8221; alt=”Twitter” width=”90″ height=”90″ border=”0″ /></p></td>

I only want to edit the portion that is highlighted and not have to copy and paste it all every time. I want a doc that has all of the html (not all shown here), be able to only insert the links I need and then be able to copy and paste all of the text.

Any ideas???? PLEASE???? Thanks.