Displaying the page source, you this can be seen in the HTML code:
<select name="issuetype" id="issuetype" class="imagebacked">
        <optgroup label="Quality Assurance">            <option id="issuetype100117" class="10011" value="7" style="background-image: url(/jira/images/icons/bug.gif);"
                        >NCR</option>
            <option id="issuetype100118" class="10011" value="8" style="background-image: url(/jira/images/icons/task.gif);"
                        >CAR</option>
            <option id="issuetype100119" class="10011" value="9" style="background-image: url(/jira/images/icons/improvement.gif);"
                        >PAR</option>
        </optgroup>        <optgroup label="[snip]">            <option id="issuetype100121" class="10012" value="1" style="background-image: url(/jira/images/icons/bug.gif);"
             selected="selected"             >Bug</option>
            <option id="issuetype100124" class="10012" value="4" style="background-image: url(/jira/images/icons/improvement.gif);"
                        >Improvement</option>

            <option id="issuetype100122" class="10012" value="2" style="background-image: url(/jira/images/icons/newfeature.gif);"
                        >New Feature</option>
            <option id="issuetype100123" class="10012" value="3" style="background-image: url(/jira/images/icons/task.gif);"
                        >Task</option>
        </optgroup>    </select>
  <a class="localHelp" href="/jira/ShowConstantsHelp.jspa?decorator=popup#IssueTypes" onclick="var child = window.open('/jira/ShowConstantsHelp.jspa?decorator=popup#IssueTypes', 'jiraLocalHelp', 'width=600, height=500, resizable, scrollbars=yes'); child.focus(); return false;"><img src="/jira/images/icons/help_blue.gif" title="Get online help about Issue Type " /></a>