From http://www.w3schools.com (Copyright Refsnes Data)

JavaScript toLowerCase() Method

String Object Reference JavaScript String Object

Definition and Usage

The toLowerCase() method converts a string to lowercase letters.

Syntax

stringObject.toLowerCase()

Example

Example

Convert a string to lowercase letters:

<script type="text/javascript">

var str="Hello World!";
document.write(str.toLowerCase());

</script>

Try it yourself »

String Object Reference JavaScript String Object

From http://www.w3schools.com (Copyright Refsnes Data)