// ---------------------------------------------------------
//  Filename: random_tile.js
//  Doc Type: application/javascript or text/javascript
//  Author:   J. Blustein
//  Version:  13 October 2008
//  Comments: For CompSci 3172 Random Tile JavasScript demo
// ---------------------------------------------------------

function renumber() {
  var random = Math.floor(Math.random() * 90)+10;
  var W3CDOM = document.createElement && document.getElementsByTagName;
  if (W3CDOM) {
    var cell = document.getElementById('cell');
    if (cell) {
      cell.firstChild.nodeValue = random;
    } else {
      alert('Something is very wrong, variable "cell" is undefined');
    }
  } else { // guess MSIE
    cell.innerText = random;
  }
} // renumber()