window.onload = prepare_print_button;

function prepare_print_button() {
    if(!document.getElementById) return false;
    if(!document.getElementById("printbutton")) return false;

    var printbutton = document.getElementById("printbutton");
    printbutton.innerHTML = '<a href="javascript: window.print();"><img class="nib" src="images/print.gif" width="74" height="27" alt="" /></a>';
}