What is wrong with

if (gadgets.util)
{
    newApi = true;
    prefs = new gadgets.Prefs();
    gadgets.util.registerOnLoadHandler(init);
}
else {
    alert("oldapi");
    newApi = false;
    prefs = new _IG_Prefs();
    _IG_RegisterOnloadHandler(init)
}

function resize() { if (newApi) gadgets.window.adjustHeight(); else
_IG_AdjustIFrameHeight();}

// combined with

function changeClassVisibility( targclassname, bVis )
{
        // get all elements
        obj = document.getElementsByTagName("*");

        // itarate all elements
        for (i=0; i<obj.length; i++) {
                /* element with classname that matches the stuff to hide? */
                if ( obj[i].className == targclassname ) {
                        with ( obj[i] ) {
            if (bVis) style.display = "inline";
            else style.display = "none";
                        }
                }
        }
    resize();
}


// to show/hide stuff?

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