Hello - I am getting a Unekpected Token Illegal for my button to assign ownership to the person that clicks the button.

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

// identify the record 
var c = new sforce.SObject("Checklist__c"); 
c.id = "{!Checklist__c.Id}"; 

// make the field change 
c.Ownerid= {!$User.Id}; 


// save the change 
sforce.connection.update([c]); 

//refresh the page 
window.location.reload();