This is probably an exceedingly simple oversight on my part, as I am new to JS and coding in general. So I apologize in advance! I have cobbled together this bit of JS from various sources in order to make a custom list button that replicates the "Send an Email" button in Salesforce, but does so with a few important differences:

• Prepopulates the To and CC fields with text from other custom fields.
• Auto-selects a specific email template.
• Utilizes the merge fields of the email template, pulling data from a record in a custom object. This record would be selected via the checkboxes generated by the custom list button, like so:

The user will check one item, then click the Email Comment button, which will pull in the record ID of the checked record and apply the data to the merge fields of the email template.

Now here's the problem. Whenever I do this now, I receive an error:

A problem with the OnClick JavaScript for this button or link was encountered:

Unexpected string

So now I'm stuck! Please help! Here is the code that is entered under the custom list button.

{!REQUIRESCRIPT("/soap/ajax/19.0/connection.js")} //adds the proper code for inclusion of AJAX toolkit 
var checked= {!GETRECORDIDS($ObjectType.Change_Comment__c)}; //grabs the records that the user is requesting to update 
var record = (checked.toString()); 

if (record[0] == null) { //if the button was clicked but there was no record selected 
alert("Please select one record."); //alert the user that they didn't make a selection 
} else if (record.length > 1) { 
alert("Please select ONLY one record."); 
} else { 
location.replace('/email/author/emailauthor.jsp?retURL=/{!SLX__Change_Control__c.Id}&p24={!SLX__Change_Control__c.Requestor_s_Email__c}&p4={!SLX__Change_Control__c.Reports_To_Email__c}&p3_lkid=' + record '&template_id=00X70000001SBNg&'); 
}