How to Get a China Visa on Arrival from Hong Kong?

I come from Indonesia, and I've never been to China before and plan to visit Guangzhou, China for business this year. I've heard that we can apply for Visa on Arrival in HongKong to enter the mainland of China. My questions are:

1. Can I also enter Guangzhou by using that visa?
2. How many days can I stay in China (Guangzhou and Shenzhen) by using that visa?
3. How much does it cost and how long does it take to get that visa ready to be used since the moment I apply it? (let's say I come very early on that day).

Thanks so much!
ps: I don't want to apply for visa to China in Jakarta but Hong kong since I stay far from Jakarta.

Someone will probably come on and give a better answer, but here is what I know.

You have separate Visa's for Hong Kong SAR to mainland China, but once you get you China visa that allows you to travel to all parts of China that aren't listed as SAR. That is most places, including Guangzhou and Shenzhen. You can apply for a China visa in Hong Kong. I did mine through a visa agency called HiTouch Consulting, I imagine you can do the same. From memory, the visa is different prices depending what country your from and how long you wanna stay there. At least, I know the Americans had to pay more that what I did (hahaha). I can't remember how much I paid (not too much though), and I'm not on an Indonesian passport any way, so its probably different.

There is a difference between applying for visas in Hong Kong and your own country. If you apply in your own country, you can get a 6 months multiple entry visa that allows to to travel in and out of China as many times as you like within those 6 months. In Hong Kong you can only get single or double entry visas valid from 3 months to 1 year long. What is more, China visa is much more easier to apply in Hong Kong than in your own country.The biggest strongpoint of applying a China visa fromHong Kong is all things done in one day. These different visa types have different costs attached. If you are interested in the visa service of HiTouch Consulting, you can visit: www.hitouchco.com

China visa on arrival from Hong Kong in one day:
Nation Available: Singapore, Japan, South Korea, Australia, Norway, Brunei, Bosnia and Herzegovina, Thailand, Portugal, Slovenia, Denmark, Sweden, Finland, New Zealand, Serbia, Canada, Germany, the Netherlands, Holland, Iran, India, Italy, Ireland, Indonesia, Belgium, Austria, Switzerland, Skocjan Caves, Spain, Slovakia and the Czech republic, Peru, Paraguay, Philippines, Estonia, Latvia, Hungary, Bulgaria, Latvija, Malaysia, Uruguay;

Armenia, Azerbaijan, Britain, Brazil, Mexico, Venezuela, Burundi, Burkina Faso, Botswana, Chad, Comoros, Romania, Lithuania, Equatorial Guinea, Eritrea, Ethiopia, Columbia, Djibouti, Gabon, Greece, Lesotho, Cote d'Ivoire, Mauritius, Madagascar, azerbaijan, Albania, Mozambique, Morocco, Namibia, Seychelles, Tunisia, Benin, Togo,Ukraine, Bolivia, Ecuador, Chile, Armenia, Guinea Bissau, Panama, Kenya, Malawi, Moldova, Russia, Sudan, South Sudan, Swaziland, Senegal, Tanzania, Zimbabwe, Zambia, Burundi (male and female)