Mountain Lion Download Problems

I recently purchased Mountain Lion and once I followed the instruction for downloding it, it started to work. Unfortunately my internet cut off and so did my download bar. Because the download was stopped I went into my app store to download it again but everytime I press download it goes gray for a few seconds and then nothing happens.There's no download bar at the bottom and nothing happens in the app store and I can't check to see if it's downloading in any other way. Could someone please help me on what to do?