function hideAll() {
  var details = new Array('1','2','3');
  var length = details.length;
  for (i=0; i<length; i++) {  
    var namer = 'detail' + (i+1);
    // if DOM-compliant browser...
    if (document.getElementById) { 
      document.getElementById(namer).style.display='none';
    }
    // else if IE (specifically ie4, ie5?)
    else if (document.all) {
      document.all(namer).style.display='none';
    }
  }
}

function show(x) {
  hideAll();
  var namer = 'detail' + x;
  document.getElementById(namer).style.display='block';
}