<script language="javascript" type="text/javascript">
var userName;
userName = 'Telson Smith';
document.write(userName);
userName = 'Johnny Smith';
document.write('<br />');
document.write(userName);
</script>
<!-- DETAIL!!! -->
<script language="javascript" type="text/javascript">
var userName; // Variable Declaration, declares variable userName
userName = 'Telson Smith'; // Variable Initialization, gives value to variable userName
document.write(userName); // Outputs value of variable in (), in this case userName
userName = 'Johnny Smith'; // Variable Reassignment, changes value of variable userName
document.write('<br />'); // Moves down a line in document
document.write(userName); // Outputs value of newly changed variable in () found in line 4 (userName=”Johnny Smith”)
</script>
<!-- Example of way to Declare and Initialize variable in single statement (i.e. create the variable and give it a value in one line -->
<script language="javascript" type="text/javascript">
var userName = 'Telson Smith'; // Declares variable userName and give it value 'Telson Smith'
</script>