def getHtml(urlNum, allUrlList, urlImgQueue, urlQueue):
while (urlNum < 20 and urlQueue.not_empty):
url = urlQueue.get()
thisHtml = Html(url)
html = thisHtml.getHtml()
if (html != None):
thisUrl = Url(html, allUrlList, urlQueue, urlImgQueue, urlNum)
allUrlList, urlQueue, urlImgQueue, urlNum = thisUrl.getUrl()
