was the thread.
a friend helped gave me the following to add to sketch.
document.oncontextmenu = function() {
return false;
}
working good now, thanks for replying.
I think it should be added to the reference as the potential defaults issue was hinted at but the given examples didnt work in my case, though fundamentally the same code. i am using web editor. I can post link to code later if you think ive found a glitch. #noobCoder 
thanks