GoogleMaps v3 API Create only 1 marker on click

Question

I am successfully creating a marker on click however, using the following code, I get a new marker with every click, I only ever want one marker added and if someone clicks

Answer 1

this works fine jsfiddle http://jsfiddle.net/incals/o7jwuz12

and this for complete code: https://github.com/Lavkushwaha/Google_Maps_API_Without_PHP_DOM/blob/master/single.html