非常好的东西，有助于学习css虑镜，转msdn [2]

function changeTrans() {
    obj = getControlObject("oSelect");
    selectedValue = obj.options[obj.selectedIndex].value;
    if (selectedValue != "empty") {
        if (selectedValue.indexOf('Barn')!=-1) {
       oControlsSpan.innerHTML = oBarnControls.innerHTML;
       barnTransChange();
        }
        else if (selectedValue.indexOf('Blinds')!=-1) {
       oControlsSpan.innerHTML = oBlindsControls.innerHTML;
       blindsTransChange();
        }
        else if (selectedValue.indexOf('Checkerboard')!=-1) {
       oControlsSpan.innerHTML = oCheckerboardControls.innerHTML;
       checkerboardTransChange();
        }
        else if (selectedValue.indexOf('Fade')!=-1) {
       oControlsSpan.innerHTML = oFadeControls.innerHTML;
       fadeTransChange();
        }
        else if (selectedValue.indexOf('Iris')!=-1) {
       oControlsSpan.innerHTML = oIrisControls.innerHTML;
       irisTransChange();
        }
        else if (selectedValue.indexOf('Pixelate')!=-1) {
       oControlsSpan.innerHTML = oPixelateTransControls.innerHTML;