AS2; FLASH 8 ; onRelease function not working for movie clip

hi every body,
plaease help if anybody can!
i m a mediator or u can way still beginner for flash8 & actionscript 2.0;
please have a look at this screenshot of flash file i m working on.

(please see actionscript at the last of this page)

the seven dots u see on the stage are 7 emptymovieclips. i’ve coded the action script
to load the thumbnails in 6 emptymovieclips on left side arranged in grid ( u can see).
script is working fine till 6 thumbnails are loaded in the grid.(from externel xml file as i’ve coded)

as logically u can guess that, when we click on a thumbnail, it’s bigger copy should be loaded in the black square on he stage. but it is not happening ; i;ve coded for it also ;
in the following script u can see that the last command is:
[FONT=Calibri]_root.thumb0.onRelease = function() {[/FONT]
[FONT=Calibri]trace (“clicked”);[/FONT]
[FONT=Calibri]}[/FONT]
[FONT=Calibri][FONT=Arial]it should dispaly “clicked” on output window when thumb0 is clicked but it isn’t showing anything. not any error even. the above line is in firstframe’s action script; and it must should work from here only, not under the AS of thumb0 movieclip.[/FONT][/FONT]
[FONT=Calibri][FONT=Arial]//////////////////////////////////////////////////////actionscript for the first frame of layer1///////////////////////////////////[/FONT][/FONT]
[FONT=Calibri]xmlData = new XML();[/FONT]
[FONT=Calibri]xmlData.ignoreWhite = true;[/FONT]
[FONT=Calibri]xmlData.onLoad = loadXML;[/FONT]
[FONT=Calibri]xmlData.load(“david.xml”);[/FONT]
[FONT=Calibri]function loadXML(loaded) {[/FONT]
[FONT=Calibri]if (loaded) {[/FONT]
[FONT=Calibri]image = [];[/FONT]
[FONT=Calibri]var xmlNode:XMLNode = this.firstChild;[/FONT]
[FONT=Calibri]total = xmlNode.childNodes.length;[/FONT]
[FONT=Calibri]for (i=0; i<total; i++) {[/FONT]
[FONT=Calibri]image* = xmlNode.childNodes*.childNodes[0].firstChild.nodeValue;[/FONT]
[FONT=Calibri]}[/FONT]
[FONT=Calibri]loadthumbs();[/FONT]
[FONT=Calibri]}[/FONT]
[FONT=Calibri]else {[/FONT]
[FONT=Calibri]trace (“xml file not loaded”);[/FONT]
[FONT=Calibri]}[/FONT]
[FONT=Calibri]}[/FONT]
[FONT=Calibri]function loadthumbs() {[/FONT]
[FONT=Calibri]_root.thumb0.loadMovie(image[0]+"_thumb.jpg");[/FONT]
[FONT=Calibri]_root.thumb1.loadMovie(image[1]+"_thumb.jpg");[/FONT]
[FONT=Calibri]_root.thumb2.loadMovie(image[2]+"_thumb.jpg");[/FONT]
[FONT=Calibri]_root.thumb3.loadMovie(image[3]+"_thumb.jpg");[/FONT]
[FONT=Calibri]_root.thumb4.loadMovie(image[4]+"_thumb.jpg");[/FONT]
[FONT=Calibri]_root.thumb5.loadMovie(image[5]+"_thumb.jpg");[/FONT]
[FONT=Calibri]}[/FONT]
[FONT=Calibri]_root.thumb0.onRelease = function() {[/FONT]
[FONT=Calibri]trace (“clicked”);[/FONT]
[FONT=Calibri]}[/FONT]