function getInternetExplorerVersion()
{
  var rv = -1;
  if (navigator.appName == 'Microsoft Internet Explorer')
  {
    var ua = navigator.userAgent;
    var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null)
      rv = parseInt( RegExp.$1 );
  }
  return rv;
}
window.onload = function()
{
  if ( getInternetExplorerVersion() > -1 )
  {
    if ( getInternetExplorerVersion() == 7 ) {
    	var zIndexNumber=500;$('div').each(function(){$(this).css('zIndex',zIndexNumber);zIndexNumber-=5;});
    }
  }
  
}