function myrnd(v){
					return Math.floor(Math.random() * v);
				}
				function videoSetupEx(){
					//ok
				}
				function videoLoopEx() {
					if(myrnd(100)>90){
						context2.beginPath() ;
						context2.drawImage(myvideo, 0, 0, srcwid, srchei);
						mycontext.drawImage(canvas2,0,0);
					}
				}