var o ={x:7,y:8,z:9};
//var a = [];i=0;
//document.write(a[0]);
//for(a[i] in o){
 // document.write(a + i + a[i] + "<br/>");
//  document.write(a[0]);
//}
for(b in o){
  document.write(b+"<br>");
  document.write(o[b]+"<br>");
}