Unable to redirect on javascript button click

I am using the below javascript to create a record and redirect to google.com. On Button click it is unable to redirect it to google.com. Instead the url is becoming like

https://ap1.salesforce.com/www.google.com

And also i am unable to get user info.

{!REQUIRESCRIPT("/soap/ajax/29.0/connection.js")}

var acct = new sforce.SObject("Userinfo__c");
var user = sforce.connection.getUserInfo();
acct.LoginTime__c= new Date().toISOString();
acct.User_Name__c = user;
var result = sforce.connection.create([acct]);

if(result[0].getBoolean("success")){
window.location="http://www.google.com";
}else{
alert('Could not create record '+result);
}