Thank you so much Larry, it is now showing.
In the Google code, which was from an example, I renamed the infowindow div to test as below:
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var contentString = '<div id="test">'+
It was id="content" in the example and I have a div with the ID of content already in the page, perhaps that was affecting it.
I do not that there are vertical scrollbars for the div and if it were just that 30 px higher, they would not be needed.
Is there a simple example you could give me please to increase the height, (or even widths would be very handy sometimes)
Thanks