Replace HTML and strings of text in Greasemonkey?

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Here's the piece of code I have:

<select name="typeartist" class="listbox">
<option value="Photographer">Photographer</option>
<option value="Writer">Writer</option>
<option value="Musician">Musician</option>
<option value="Anime Artist">Anime Artist</option>
<option value="Anthro Artist">Anthro Artist</option>
<option value="Watcher">Watcher</option>
<option value="PrOn Artist">PrOn Artist</option>
<option value="Digital Artist">Digital Artist</option>
<option value="Traditional Artist">Traditional Artist</option>
<option value="3D Modeller">3D Modeller</option>
<option value="Landscaper">Landscaper</option>
<option value="3D Animator">3D Animator</option>
<option value="App Skinner">App Skinner</option>
<option value="Art Whore">Art Whore</option>
<option value="Fursuit Maker">Fursuit Maker</option>
<option value="Fursuiter">Fursuiter</option>
<option value="Crafter">Crafter</option>
<option value="Remixer">Remixer</option></select>

That "..." is supposed to be a ">", I'm not sure why it is being replaced by yahoo.

Here's what I want to replace it with

<input type="text" name="typeartist" value maxlength="255" class="textbox">

I want to replace a few other elements, but once I have the code for this I'm sure I can get that done on my own.

Is there a way I can have Greasemonkey replace things based on a string search of the HTML? That would make it very quick and easy for me to throw together a script that is just for personal use.