// place inside the body tag	
var agent = navigator.userAgent.toLowerCase(); 	
if(agent.indexOf("mac") != -1 && document.all){		
document.body.scroll = "no";	}


// place inside the body tag	
var agent = navigator.userAgent.toLowerCase(); 	
if(agent.indexOf("mac") != -1 && document.all && document.getElementsByTagName){		
  document.getElementsByTagName("body")[0].style.overflow = "hidden";	}