SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<select name="FK_BrandID">
    <option value="0">Zero</option>
    <option value="1" selected="selected">One</option>
    <option value="2">Two</option>
</select>

JavaScript

var sel = document.getElementsByName("FK_BrandID")[0];
var modelLength = sel.options[sel.selectedIndex].text;
alert(modelLength);