I'm new to PHP and I came across an example in a beginner's book that I couldn't get to work:

PHP Code:
$MyArray[7] = 23;
echo 
'<script>alert(' $MyArray[7] + 50 ')</script>' 
Now, I'm not sure if the Kindle browser app I'm using to read this book screwed up the formatting, but that's exactly how it appeared. The output is supposed a JS alert box displaying the number 73. However, it just outputs "50)". I tried changing some of the syntax around but I couldn't figure it out. Any thoughts?

Thanks!