function checkBrowserName(name){  
 var agent = navigator.userAgent.toLowerCase();
 if (agent.indexOf(name.toLowerCase())>-1) {  
   return true;  
 }  
 return false;  
}  

window.onload = function(){

  if(checkBrowserName('safari')){  
    
    $('.whiteborder').attr('class', 'whiteborder_safari');
    $('.greyborder').attr('class', 'greyborder_safari');
    $('.whiteborder2').attr('class', 'whiteborder2_safari');
    $('.bild').attr('class', 'bild_safari');
    $('td.text').attr('class', 'text_safari');
    $('ul.navigation2').attr('class', 'navigation2_safari');
    
  }  

};