html - I want to use javascript to insert an attribute to an element

Question

Any ideas how I would go about writing a javascript method to insert an attribute to a tag

eg. I have

<input id='in1' value='Submit' type='submit'/>

and I want to insert an attribute name

<input id='in1' name='submit_content' value='Submit' type='submit'/>

Thanks

Answer 1

Try this:

document.getElementById("in1").setAttribute("name", "submit_content");