var OriPicNum = 0;
var CurDocument = 0;
var CurPicNum = 0;
var CurUrl = "";
 
function preLoadPicture(pic) {
heavyImage = new Image(); 
heavyImage.src = CurUrl + "lq" + pic + ".jpg";
}
 
function getNextThumbNum(CurNum) {
thumbs = new Array(1,2,3);
for (i = 0; i < thumbs.length; i++) {
if (thumbs[i] > CurNum) {
return thumbs[i];
}
}
return thumbs[0];
}
 
function nextThumbnail(idDoc) {
if (CurDocument != 0 && idDoc == CurDocument) {
document.getElementById(CurDocument).src = CurUrl + "lq" + CurPicNum + ".jpg";
nextthumb = getNextThumbNum(CurPicNum);
preLoadPicture(nextthumb);
CurPicNum = nextthumb;
setTimeout("nextThumbnail("+ CurDocument +")", 600);
}
}
 
function stopThumbSlide() {
TmpDoc = CurDocument;
CurDocument = 0;
document.getElementById(TmpDoc).src = CurUrl + "lqd.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);
}
}