Remove White Spaces From Validation?

i m using the following validation code to validate email id

if (!/^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,4})+$/.test(document.getElementById("customer_name").value))
{
msg=msg+"Must Enter a valid Login-id/Email
";
document.getElementById("customer_name").focus();
}

now i need that if the email id contains white blank space in front of email id or end of email id then this validation should pass otherwise not.

at present if there is blank space in front and end of email id then the validation doesnt passes and gives alert.

what should i add in it to validate it or how can it automatically remove white spaces before validating.