www.applehelp.net window will not close

I was directed to a website addressed mp4jet and this came up. I was not able to close the browser window and clicking on OK simply refreshed the window and alert box. I suspected that this was not a legitimate apple website solution. I force quit Safari, disconnected my internet connection to my computer and restarted Safari. Safari gave me a warning that I was not connected to the internet. This allowed me to close all Safari windows. I quit Safari again, reconnected my internet to the computer and then opened Safari. I was back to normal. I hope this helps other Mac users.