This is an integer value which is likely to be 1 most of the time. It is only meaningful if the Select.multiple property is true and more than one item has been selected.

Here is a workaround for other browsers that don't have this property, kindly donated by Jon Stephens:

   <SCRIPT>

   var mySize=0;

   for(var i=0; i<mySelect.options.length; i++)

   {

      mySize += mySelect.options[i].selected ? 1 : 0;

   }

   mySelect.size = mySize;

   </SCRIPT>