html print portion of a document javascript iframe

function printHTML(html){
var ifr = document.createElement("iframe");
document.body.appendChild(ifr);
var c = ifr.contentWindow;
c = (ifr.contentWindow) ? ifr.contentWindow : (ifr.contentDocument.document) ? ifr.contentDocument.document : ifr.contentDocument;
c.document.open();
c.document.writeln(html);
c.document.close();
c.focus();
c.onafterprint = function() {
document.body.removeChild(ifr);
}
c.print();
}