// Watch your commas in the array
var topic_name = new Array(
"<a href='ins-automobile.html'><img src='images/topic_autoquote.jpg' width='340' height='70' border='0' alt='Click for a quick quote'></a>",
"<a href='life-dental.html'><img src='images/topic_dentalbenefits.jpg' width='340' height='112' border='0' alt='Click for a details'></a>"
);

var x = topic_name.length;

var rnd_no = Math.round((x-1)*Math.random());

var topic_display = topic_name[rnd_no];