function CheckAndShowPage( os_page, browser_page ) {
   CheckAndAct("document.location='" + os_page + "'",
               "document.location='" + browser_page + "'",
               "" );
}

function CheckAndAct( os_cmd, browser_cmd, ok_cmd ) {

   var agt=navigator.userAgent.toLowerCase();
   var is_major = parseInt(navigator.appVersion);
   var is_minor = parseFloat(navigator.appVersion);

   var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
   var is_ie3    = (is_ie && (is_major < 4));
   var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );

   var is_ie5up  = (is_ie && !is_ie3 && !is_ie4);

   var is_win = (agt.indexOf("win") != -1);

   if ( !is_win ) { eval(os_cmd); }
   else if ( !is_ie5up ) { eval(browser_cmd); }
   else { eval(ok_cmd); }
}

 
function ISSwitchDWrite( good, bad ) {
   CheckAndAct( "", 'document.write("' + bad  + '")',
                    'document.write("' + good + '")' );
}