$(document).ready(function($){
	var deviceAgent = navigator.userAgent.toLowerCase();
	var agentID = deviceAgent.match(/(ipad)/);
	if (agentID) {

        // do something special
		$('body').addClass('ipad');
 
	}
});

$(document).ready(function($){
	var deviceAgent = navigator.userAgent.toLowerCase();
	var agentID = deviceAgent.match(/(iphone|ipod)/);
	if (agentID) {

        // do something special
		$('body').addClass('iphone');
 
	}
});