var hayasa=60;
var yokohaba=2170;
var myphoto=new Image();myphoto.src="wro2010.jpg";
var yake,i=0,hata=true;
function go_stop(){if(hata){teisi();}else{go();};hata=!hata;}
function go(){clearInterval(yake);kobo=true;yake=setInterval("susumu()",hayasa);}
function susumu(){if(i<yokohaba){i++;document.getElementById("mybk").style.backgroundPosition=i*-1;}else{clearInterval(yake);i=0;go();}}
function teisi(){clearInterval(yake);}