noteval.js

function noteval(code, doc){
    // add some javascript to a document, like an iframe
    //
    // var iframe = document.getElementById("theframe");
    // noteval('alert("hi")', iframe.contentDocument || iframe.)
    
    var e = doc.createElement("script"),
        how = "text" in e ? "text" :
            "textContent" in e ? "textContent" :
            "innerHTML" in e ? "innerHTML" :
            "appendChild"
    ;
        
    if(how == "appendChild"){
        e[how](d.doc.createTextNode(code));
    }else{
        e[how] = code;
    }
        
    (doc.head || doc.getElementsByTagName("head")[0]).appendChild(e);

}