JavaScript Form Validation - specific field entry needed but in upper/lower case -

i have simple form single field works password, letting user next page when click submit, if correct 'referral code' entered in field.

i need js validation code allow word 'garlic' entered in upper or lower case or mixture of both pass validation. 'garlic' can used referral word though. below code have validates 'garlic' in lower-case.

any assistance in being able validate 1 word in upper , lower-case , both appreciated.

function validatecontactform() {     var codeentry = document.form1.code;     if (codeentry.value == "") {         window.alert("our apologies, code not match our records; please call us");         codeentry.focus();         return false;     } else if (codeentry.value !== "garlic") {         alert("our apologies, code not match our records; please call us.");         codeentry.focus();         return false;     }     return true; } 

make both upper (or lower) case, compare.

codeentry.value.touppercase() !== "garlic"