<select id ="sela" title="Basic example" multiple="multiple" name="example-basic" size="5">
<option value="V1">Option 1</option>
<option value="V2">Option 2</option>
<option value="V3">Option 3</option>
<option value="option4">Option 4</option>
<option value="option5">Option 5</option>
<option value="option6">Option 6</option>
<option value="option7">Option 7</option>
<option value="option8">Option 8</option>
<option value="option9">Option 9</option>
<option value="option10">Option 10</option>
<option value="option11">Option 11</option>
<option value="option12">Option 12</option>
</select>

$(function(){
$("select").multiselect({
noneSelectedText: "==請選擇==",
checkAllText: "全選",
uncheckAllText: '全不選',
selectedList:4
});
});

MyValues:function(){
return multiValues;
}

function showValues() {
var valuestr = $("#sela").multiselect("MyValues");
alert(valuestr);
}