var userAgent = navigator.userAgent.toLowerCase();

var regExpUserAgent = new RegExp("(ipod|iphone|windows ce|blackberry|opera mini|mobile|palm|portable)");
var regExpUserAgentiPad = new RegExp("(ipad)");

if (userAgent.match(regExpUserAgent) && !userAgent.match(regExpUserAgentiPad)) 
{    
    window.location = ("/mobile/default.aspx");
}