//Target Safari
if( $.browser.safari )
    alert("Safari");

//Target anything above IE6
if ($.browser.msie && $.browser.version > 6 ) 
    alert("Safari");

//Target IE6 and below // should be illegal
if ($.browser.msie && $.browser.version <= 6 ) 
    alert('IE 6 or below version');

//Target Firefox 2 and above
if ($.browser.mozilla && $.browser.version >= "1.8" ) 
    alert('IE above 6');