rem: throw BadMojo (ERR_REQUIRED_PARAM, "f"); 
add: throw new BadMojo (ERR_REQUIRED_PARAM, "f"); 
context: function displayFrame (f, idx, showSource){    if (!f)        throw BadMojo (ERR_REQUIRED_PARAM, "f");    if (typeof idx == "undefined")    {        for (idx = 0; idx < console.frames.length; ++idx)            if (f == console.frames[idx])                break;            if (idx >= console.frames.length)            idx = MSG_VAL_UNKNOWN;    }        if (typeof idx == "number")        idx = "#" + idx;        display(idx + ": " + formatFrame (f));    if (showSource)            displaySource (f.script.fileName, f.line, 2);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f3d6f202e03bf7eb5a523e578f7f3f815c60a85b/venkman-debugger.js/clean/extensions/venkman/resources/content/venkman-debugger.js