function createButton() {
    var a = document.createElement('a');
    a.href = '#';
    a.innerHTML = 'Print Topic';
    a.style.position = 'absolute';
    a.style.right = '3em';
    a.style.top = '6em';
    a.style.fontFamily = 'Arial,Helvetica,sans-serif';
    a.style.fontWeight = 'bold';
    a.style.fontSize = '125%';
    a.style.background = '#777777 none repeat scroll 0 0';
    a.style.color = 'white';
    a.style.padding = '6px 12px';
    document.body.insertBefore(a, document.body.lastChild);
}

function createButton() {
    var a = document.createElement('a');
    var css = document.createElement('style');
    css.type = 'text/css';
    css.innerHTML = '#prt { position:absolute; right:3em; top: 6em; font-family: Arial,Helvetica,sans-serif; font-weight:bold; font-size:125%; background: #777777 none repeat scroll 0 0; color: white; padding: 6px 12px;}'
    a.href = '#';
    a.innerHTML = 'Print Topic';
    a.id = 'prt';
    document.body.insertBefore(a, document.body.lastChild);
    document.body.appendChild(css);
}

s = a.style;

s.position = "absolute";
...etc...
s.color = "white";

$("a").css({position: "absolute", right: "3em", top: "6em"}) // etc.

$("<a href='toto/'></a>")
    .css("position", "absolute");
    .css("right", "3em")
    .appendTo($(containerid));

with a.style {
  position = 'absolute';
  right = '3em';
}

function setStyle(elem) {
  with elem.style {
    position = 'absolute';
    right = '3em';
  }

  return elem
}

//Invoke like this: elem = setStyle(elem)

<style type='text/css'>
 a .prt {
 position:absolute;
 right:3em;
 top: 6em;
 font-family: Arial,Helvetica,sans-serif;
 font-weight:bold;
 font-size:125%;
 background: #777777 none repeat scroll 0 0;
 color: white; padding: 6px 12px;
}
</style>
<script>
function createButton() {
 var a = document.createElement('a');
 a.class= 'prt';
 document.body.insertBefore(a, document.body.lastChild);
}
</script>