// This function returns Internet Explorer's major version number,
// or 0 for others. It works by finding the "MSIE " string and
// extracting the version number following the space, up to the decimal
// point, ignoring the minor version number
function msieversion()
{
   var ua = window.navigator.userAgent
   var msie = ua.indexOf ( "MSIE " )

   if ( msie > 0 )      // If Internet Explorer, return version number
      return parseInt (ua.substring (msie+5, ua.indexOf (".", msie )))
   else                 // If another browser, return 0
      return 0

}