ignore case in javascript

is there a way to ignore case in javascript?
I would like to check if the value of the country text box is either UNITED STATES or United States or USA or usa- if,so I would like to change it to US
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Yury MerezhkovDevelopment Team LeadCommented:
Convert everything to lower case and then compare:

var original = ”usa”;

var input = document.getElementById("Your_Input_Field_Here").value;

var userInput = input.toLowerCase();

if(original == userInput) {
} else {
Use a regular expression for this:

var myVal = "USA";

if (myVal.match(/^(United States|usa)$/i) { alert("Match"); }

The "i" after the regular expression makes the match case insensitive.

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