Bootstrap question

<!--I removed the href attr and I set an id-->
<span class="button" id="myButton" style="button.gif"  > MyButton </span>

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//First I set a variable to span element
var spanElem=document.getElementById('myButton');
//Then I create a button element and define it to a var
var buttonElem=document.createElement('button');
//I set the innerHTML value and the bootstrap class
buttonElem.innerHTML='MyButton';
buttonElem.setAttribute('class', 'btn btnPrimary');
//I use the replaceWith() function to replace the spanElem
//element with the button element.Finally I set a click event
//to span that when I click on it to replace the span element
spanElem.addEventListener('click',function(){
spanElem.replaceWith(buttonElem);
});

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