Google AdWords Conversion Tracking with jQuery

fireConversionCode.js

// accepts 1 parameter which is passed straight through to php file for determining which tracking code to display 
function fireConversionCode( code )
{

    // check to see if iframe is already created. We only want to create one iframe on the page, but can load multiple pixels
    if ( $('#trackingFrame').length == 0 )
    {
        // create empty iframe
        var  iframe = $('<iframe id="trackingFrame" width="0" height="0">').css({"width":"0px","height":"0px"});
        // append to end of document
        $('body').append(iframe);
    }
    else
    {
        // load tracking frame for use
        iframe = $('#trackingFrame');
    }
    
    // now that we have the iframe loaded, call load page which will display the tracking code
    // doesn't have to php, could point to a .html file
    $(iframe).get(0).src = "tracking.php?code=" + code;

}