function preLoadPicture(pic) {
	heavyImage = new Image(); 
	heavyImage.src = CurUrl + pic + ".jpg";
}

var OriPicNum = 0;
var CurDocument = 0;
var CurPicNum = 0;
var CurUrl = "";

function getNextThumbNum(CurNum) {
	var i = CurNum + 1;
	if (i > 6) {
		i = 1;
	}
	return i;
}

function nextThumbnail(idDoc) {
	if (CurDocument != 0 && idDoc == CurDocument) {
		document.getElementById("pic_" + CurDocument).src = CurUrl + CurPicNum + ".jpg";
		nextthumb = getNextThumbNum(CurPicNum);
		preLoadPicture(nextthumb);
		CurPicNum = nextthumb;
		setTimeout("nextThumbnail("+ CurDocument +")", 500);
	}
}

function stopThumbSlide() {
	TmpDoc = CurDocument;
	CurDocument = 0;
	document.getElementById("pic_" + TmpDoc).src = CurUrl + OriPicNum + ".jpg";	
}

function startThumbSlide(IdDoc, CurNum, Url) {
	if (CurDocument == 0) {
		OriPicNum = CurNum;
		CurDocument = IdDoc;
		CurUrl = Url;
		nextthumb = getNextThumbNum(CurNum);
		preLoadPicture(nextthumb);
		CurPicNum = nextthumb;
		setTimeout("nextThumbnail("+ CurDocument +")", 20);
	}
}