[jQuery] dynamically change size of select box

[jQuery] dynamically change size of select box


How do I dynamically change size of select box depending on the number
of responses retreived froma getJSON
[code]
$.getJSON("select.php",
{project:"%" }, function(json){
var dropsize=json.length +2;
var options = "";
options += '<option value="%">All Projects</option>';
for (var i = 0; i < json.length; i++) {
options += '<option value="'+json[i]['project']+'">'+json[i]
['project']+'</option>';
}
$("#select_project").html(options);
[/code]
now I want to set the select box to have a size=dropsize
for example if the getJSON returned 8, dropsize=8 and the select would
look like
<select id="select_project" name="select_project" size="8">
thanks
K