var basedensity = 30;
var last;

function slowup(theimg,test,test2) {
    browserdetect = theimg.filters ? "ie" :
       typeof theimg.style.MozOpacity == "string" ? "mozilla" : "";
    if (last || (last == theimg)) { // in case we are going back to the same image
        clearInterval(highlight);
        instantset(basedensity, last);
        last = false;
    }
    imgobj = theimg;
    instantset(test2, imgobj); //basedensity
    highlight = setInterval("gradualin(imgobj)",test); //50
    last = imgobj;
}

function slowdown(theimg) {
    clearInterval(highlight);
    imgobj = theimg;
    highlight = setInterval("gradualout(imgobj)",50);
}

function instantset(degree, obj) {
    if (browserdetect == "mozilla") {
        obj.style.MozOpacity = degree / 100;
    } else if (browserdetect == "ie") {
        obj.filters.alpha.opacity = degree;
    }
}

function gradualout(fading) {
    if ((browserdetect == "mozilla") && (fading.style.MozOpacity > (basedensity/100))) {
        fading.style.MozOpacity =
           Math.max((parseFloat(fading.style.MozOpacity) - 0.1), (basedensity / 100));
    } else if ((browserdetect == "ie") && (fading.filters.alpha.opacity > basedensity)) {
        fading.filters.alpha.opacity -= 10;
    } else if (highlight) {
        clearInterval(highlight);
        last = false;
    }
}

function gradualin(fading) {
    if ((browserdetect == "mozilla") && (fading.style.MozOpacity < 1)) {
        fading.style.MozOpacity = Math.min((parseFloat(fading.style.MozOpacity) + 0.1), 1);
    } else if ((browserdetect == "ie") && (fading.filters.alpha.opacity < 100)) {
        fading.filters.alpha.opacity += 10;
    } else if (highlight) {
        clearInterval(highlight);
    }
}