thank you! it worked like a charm. I have one more of the same issue and I am trying to see if it wont run for the same problem or what, but I'm stumped on this and it's copied straight from the book I am using.

<!DOCTYPE html>

<html>

<head>

<title>Calculating the area of a circle</title>

</head>

<body>

<script>

//Filename areacircle2.html

//program that calculates and prints the area

//of a circle and half circle

var pi = 3.14159; // mathematical value of PI

//Ask the user for the size of the circle

var radius = promt("What is the radius of the circle?");

//calculate the area of the whole circle

var area = pi*radius*radius;

//Making these parts of the message to user strings

//both demonstrates strings and makes the alert fit

//more cleanly on a single line.

var message1 = " The area of a circle with the radius of ";

var message2 = " is ";

alert(message1 + radius + message2 + area);

alert("The area of a half circle is " + area/2);

</script>

</body>

</html>