<!--
function setLeft() {
  var viewportwidth;
  var viewportheight;
  var leftpos = 5;
  
  // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
  if (typeof window.innerWidth != 'undefined') {
    viewportwidth = window.innerWidth,
    viewportheight = window.innerHeight
  }
  // IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
  else if (typeof document.documentElement != 'undefined'
    && typeof document.documentElement.clientWidth !=
    'undefined' && document.documentElement.clientWidth != 0) {
      viewportwidth = document.documentElement.clientWidth,
      viewportheight = document.documentElement.clientHeight
  }
  // older versions of IE
  else {
    viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
    viewportheight = document.getElementsByTagName('body')[0].clientHeight
  }

  //document.write('<p>Your viewport width is '+viewportwidth+'x'+viewportheight+'</p>');
  //alert("width: " + viewportwidth + " height: " + viewportheight);
  
  leftpos = (viewportwidth - 900)/2;
  if (leftpos < 0) {
    leftpos = 0;
  }
  
  if (document.getElementById && document.getElementsByTagName) {
    document.getElementById('container_div').style.left = leftpos + 'px';
  }
}
//-->

