var ua = navigator.userAgent.toLowerCase();

var isMac   = (ua.indexOf('mac')>-1)?1:0;
var isWin   = (ua.indexOf('win')>-1)?1:0;

var isGecko   = (ua.indexOf('gecko')>-1)?1:0;
var isSafari   = (ua.indexOf('safari')>-1)?1:0;

var isOpera = (ua.indexOf('opera')>-1)?1:0;

var isIE    = (ua.indexOf('msie')>-1 && !isOpera)?1:0;

var isIEWin = (isIE && isWin && !isOpera)?1:0;
var isIEMac = (isIE && isMac && !isOpera)?1:0;
var isIEWinCE  = (isIE && ua.indexOf('windows ce')>-1)?1:0;

var isWPrint   = (window.print)?1:0;
 
var isDOM   = (document.getElementById)?1:0;

/* deprecated */
var isIE4   = (isIE && !isDOM)?1:0;
var isNS4   = (document.layers)?1:0;
var isLt4   = (parseInt(navigator.appVersion)<4)?1:0;
/* end of deprecated */

var isDOM   = (document.getElementById)?1:0;

var isIE = 0;
var isIE40 = 0;
var isIE50 = 0;
var isIE55 = 0;
var isIE60 = 0;
var isIE70 = 0;


/* unterstŸtzter Browser? isC(orrect)U(ser)A(gent) */
var isCUA = (isDOM && !isIE50 && !isIE55 && !isIEMac && !isIEWinCE)?1:0;
/* windows.onload */
function addLoadEvent(func){
  if(isCUA) {
     var oldonload = window.onload;
      if (typeof window.onload != 'function') {
           window.onload = func;
      }
      else {
         window.onload = function() {                        
               if(oldonload) oldonload();
               func();
           }
     }
  }
  else { return true; }
}