钟无艳的图片:如何破解如下Javascript 代码

谁能分析出代码的有效内容？
<form name="form1" method="post" action="Topic_list.aspx?bid=7&sid=18" id="form1">
<div>
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="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>
</div>

<script type="text/javascript">
<!--
var theForm = document.forms['form1'];
if (!theForm) {
theForm = document.form1;
}
function __doPostBack(eventTarget, eventArgument) {
if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
theForm.__EVENTTARGET.value = eventTarget;
theForm.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
}
// -->
</script>