Changing alpha on multiple movie clips?

Hi all.

So, I know how to change the alpha of one movie clip at a time on rollover, rollout, and release. But I'm a bit stuck trying to figure out how I would change the alpha of multiple movie clips, when one is clicked.

It's for a simple photo gallery and I want all the thumbnails to darken once one has been clicked & the image is loading. I can't just fake it by having a somewhat transparent black movie clip appear over everything, because I need the alpha of each thumbnail to be able to change again once people roll over a new thumbnail.

Is there any simple way to do this? Any help is much appreciated.

Thanks!

(a section of my code is included for reference but there are like 30 thumbnails so I didn't include it all, the code is the same for everything)

Code:

---

thumb_001.onRollOver = over;
thumb_001.onPress = down;
thumb_001.onRollOut = out;
thumb_001.onRelease () {
        _parent.gotoAndPlay("test");
}

thumb_002.onRollOver = over;
thumb_002.onPress = down;
thumb_002.onRollOut = out;


thumb_003.onRollOver = over;
thumb_003.onPress = down;
thumb_003.onRollOut = out;


function over() {
this._alpha=100;
}

function down() {
this._alpha=50;
}

function out() {
this._alpha=60;
}

---

If all of your thumbnails have a similar name i.e.: thumb_###, then you are in luck and there is a easier way to do it. Try something like this:

PHP Code:

---

var totalThumbCount = 30;

for(i=0; i < totalThumbCount; i++)
{
    var numFormat = "";
    
    //Format the unique numbering system
    if (i < 10)
    {
        numFormat = "00" + i;
    }
    else if (i < 100)
    {
        numFormat = "0" + i;
    }
    else
    {
        numFormat = i;
    }
    
        //Add functions for buttons
    this["thumb_" + numFormat + (i + 1)].onRollOver = function()
    {
        this._alpha = 100;
    }
    
    this["thumb_" + numFormat + (i + 1)].onRollOut = function()
    {
        this._alpha = 60;
    }
    
    this["thumb_" + numFormat + (i + 1)].onPress = function()
    {
        this._alpha = 50;
    }
    
    this["thumb_" + numFormat + (i + 1)].onRelease = function()
    {
        _parent.gotoAndStop("test");
    }
} 


---

Thanks for the response. Maybe I need to change something though because unfortunately that code didn't seem to have any effect on my files. I'm not a big coder so I don't really know what I would need to change?

There are 27 thumbs numbered like 001, 002, 003, 004, 005, 006, 007, 008, 009, 010, 011, 012, 013, etc...