last try

<script type="text/javascript" language="javascript">
    var alsoenlarge = true;
    $(function(){
      if(isScalePossible()){
        $('body').css({overflow:'hidden'}); //geen scrollbars
        $('#scalecontainer').css({position: 'absolute', margin: 0}); //centreren met de hand na resize

        // Run scale function on start
        scaleSite();
        scaleSite();

        // run scale function on browser resize
        $(window).resize(scaleSite);
      }
    });
    function scaleSite()
    {
        if(isTheRightSize(25)){
          windoww = $(window).width();
          windowh = $(window).height();
          sitew = $('#scalecontainer').width();
          siteh = $('#scalecontainer').height();
          f = windoww/sitew;
          f = windowh/siteh<f?windowh/siteh:f;
          if(!alsoenlarge && f>1) f = 1;
          $('#scalecontainer').css({
            "-moz-transform"    : "scale("+f+")",
            "-webkit-transform" : "scale("+f+")",
            "-ms-transform"     : "scale("+f+")",
            "-o-transform"      : "scale("+f+")",
            "transform"         : "scale("+f+")",
            "left"              : ((windoww-(sitew*f))/2)+"px",
            "top"               : ((windowh-(siteh*f))/2)+"px"
          });
        }
    }
    function isScalePossible()
    {
      can = 'MozTransform' in document.body.style;
      if(!can) can = 'webkitTransform' in document.body.style;
      if(!can) can = 'msTransform' in document.body.style;
      if(!can) can = 'OTransform' in document.body.style;
      if(!can) can = 'transform' in document.body.style;
      if(!can) can = 'Transform' in document.body.style;
      return can;
    }
    function isTheRightSize (minPercent){
        windoww = $(window).width();
        windowh = $(window).height();
        sitew = $('#scalecontainer').width();
        siteh = $('#scalecontainer').height();

        // tests if the window is smaller than or equal to 100%
        if(windoww <= sitew){
            // Checks to see if it is at max a percentage smaller
            if(windoww >= (sitew/100)*inPercent){
                return true;
            }
        } else {
            return false;
        }
    }

</script>