XML-script don´t read from cache afther download.

I have a gallery where the pictures will load with help from different  xml docs. This work, but it seems that the script download the pics from server every time even if the picture already should be in the computers cache. This slows down the user experiense. Is there anything who can be done with my script to prevent this? I will be thankful for any suggestions.

function loadXML(loaded) {
	if (loaded) {
		xmlNode = this.firstChild;
		image = [];
		description = [];
		description2 = [];
		total = xmlNode.childNodes.length;
		for (i=0; i<total; i++) {
			image[i] = xmlNode.childNodes[i].childNodes[0].firstChild.nodeValue;
			description[i] = xmlNode.childNodes[i].childNodes[1].firstChild.nodeValue;
			description2[i] = xmlNode.childNodes[i].childNodes[1].nextSibling.nodeValue;
			
			}
		firstImage();
	} else {
		content = "file not loaded!";
	}
}

xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("images_yttertoy.xml");
/////////////////////////////////////
listen = new Object();
listen.onKeyDown = function() {
	if (Key.getCode() == Key.LEFT) {
		prevImage();
	} else if (Key.getCode() == Key.RIGHT) {
		nextImage();
	}
};
Key.addListener(listen);
previous_btn.onRelease = function() {
	prevImage();
};
next_btn.onRelease = function() {
	nextImage();
};
/////////////////////////////////////
p = 0;
this.onEnterFrame = function() {
	filesize = picture.getBytesTotal();
	loaded = picture.getBytesLoaded();
	preloader._visible = true;
	if (loaded != filesize) {
		preloader.preload_bar._xscale = 200*loaded/filesize;
	} else {
		preloader._visible = false;
		if (picture._alpha<100) {
			picture._alpha += 25;
		}
	}
};
function nextImage() {
	if (p<(total-1)) {
		p++;
		if (loaded == filesize) {
			picture._alpha = 0;
			picture.loadMovie(image[p], 1);
			desc_txt.text = description[p];
			desc_txt2.htmlText = description2[p];
			picture_num();
		}
	}
}
function prevImage() {
	if (p>0) {
		p--;
		picture._alpha = 0;
		picture.loadMovie(image[p], 1);
		desc_txt.text = description[p];
		desc_txt2.htmlText = description2[p];
		picture_num();
	}
}
function firstImage() {
	if (loaded == filesize) {
		picture._alpha = 0;
		picture.loadMovie(image[0], 1);
		desc_txt.text = description[0];
		desc_txt2.htmlText = description2[0];
		picture_num();
	}
}
function picture_num() {
	current_pos = p+1;
	pos_txt.text = current_pos+" / "+total;
}

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