function iswap(i,k) {

  if (k==0) {
    switch (i) {
      case 0: document.mitem0.src="images/buttons/mitem0.gif";break;
      case 1: document.mitem1.src="images/buttons/mitem1.gif";break;
      case 2: document.mitem2.src="images/buttons/mitem2.gif";break;
      case 3: document.mitem3.src="images/buttons/mitem3.gif";break;
      case 4: document.mitem4.src="images/buttons/mitem4.gif";break;
      case 5: document.mitem5.src="images/buttons/mitem5.gif";break;
      case 6: document.mitem6.src="images/buttons/mitem6.gif";break;
      case 7: document.mitem7.src="images/buttons/mitem7.gif";break;
      case 8: document.mitem8.src="images/buttons/mitem8.gif";break;
      case 9: document.mitem9.src="images/buttons/mitem9.gif";break;
      case 10: document.mitem10.src="images/buttons/mitem10.gif";break;
      case 11: document.mitem11.src="images/buttons/mitem11.gif";break;
      case 12: document.mitem12.src="images/buttons/mitem12.gif";break;
      case 13: document.mitem13.src="images/buttons/mitem13.gif";break;
    }
  } else {
    switch (i) {
      case 0: document.mitem0.src="images/buttons/mitem0a.gif";break;
      case 1: document.mitem1.src="images/buttons/mitem1a.gif";break;
      case 2: document.mitem2.src="images/buttons/mitem2a.gif";break;
      case 3: document.mitem3.src="images/buttons/mitem3a.gif";break;
      case 4: document.mitem4.src="images/buttons/mitem4a.gif";break;
      case 5: document.mitem5.src="images/buttons/mitem5a.gif";break;
      case 6: document.mitem6.src="images/buttons/mitem6a.gif";break;
      case 7: document.mitem7.src="images/buttons/mitem7a.gif";break;
      case 8: document.mitem8.src="images/buttons/mitem8a.gif";break;
      case 9: document.mitem9.src="images/buttons/mitem9a.gif";break;
      case 10: document.mitem10.src="images/buttons/mitem10a.gif";break;
      case 11: document.mitem11.src="images/buttons/mitem11a.gif";break;
      case 12: document.mitem12.src="images/buttons/mitem12a.gif";break;
      case 13: document.mitem13.src="images/buttons/mitem13a.gif";break;
    }
  }

}