The portion I'm working with:
<form action='http://TestMachine/SomeForm.asp'method="post" id="MetaForm" name="MetaForm" Enctype="multipart/form-data" target="hidMFLIFrame">	
	<div class="FormContent"> 		
		<div id="FormHeader"></div>
		<div id="TabsSection" onclick="SelectTab()" class="TabRow"></div>
		<div id="FormPage" class="FormSection"></div>
		<div id="PreviewSection"></div>
		<div id="EndSection"></div>			
		<div id="buttonTable"><p><table align="center" cellspacing="15">
			<tr>
				<DIV ID="uploadanim" STYLE="position: relative; visibility: hidden;"><IMG src='http://TestMachine/Images/Upload.gif></DIV>
				<td><input id="btnPreviousTab" name="btnPreviousTab" onclick="PreviousTab()" type="button" value="Previous" disabled="true"/></td>
				<td><input id="btnNextTab" name="btnNextTab" onclick="NextTab()" value="Next" type="button" /></td>				
			
				<td><input id="btnPreview" name="btnPreview" onclick="ShowPreview()" type="button" value="Preview" disabled="true" /></td>

				<td><input id="btnSubmit" name="btnSubmit" type="button" value="Submit" disabled="true" onclick="return submitMetaForm()"/></td>																		
									
				<td><input id="btnCalculate" name="btnCalculate" type="button" onclick="Calculate()" value="Calculate" /></td>				
			</tr></table>						
									
		</p></div>
	</div>
		<input type="hidden" id="guid" name="guid"/>	
		<input type="hidden" id="pagename" name="pagename"/>
		<input type="hidden" id="hidmfltempfolder" name="hidmfltempfolder"/>		
</form>

##</code><code>##

  use LWP::UserAgent;
 $ua = LWP::UserAgent->new;
for (1 .. 6 )
{
 my $req = HTTP::Request->new(POST => 'http://TestMachine/SomeForm.asp');
 $req->content_type('application/x-www-form-urlencoded');
 $req->content('onclick="NextTab()"');
}

 my $req = HTTP::Request->new(POST => 'http://TestMachine/SomeForm.asp');
 $req->content_type('application/x-www-form-urlencoded');
 $req->content('onclick="return submitMetaForm()"');
 
 my $res = $ua->request($req);
 print $res->as_string;