// Set path to the iframe file
var filePath = 'http://www.horsevideolibrary.com/01_new/03_healthcare/03-worming-base.php';
// Setup the iframe target
var iframe='<iframe id="frame" name="widget" src ="#" width="100%" height="1" marginheight="0" marginwidth="0" frameborder="no" scrolling="no"></iframe>';
// Write the iframe to the page
document.write(iframe);

var myIframe = parent.document.getElementById("frame");
// Setup the width and height
myIframe.height = 460;
myIframe.width = 852;

myIframe.src = filePath;
// set the style of the iframe