ModalBox "objeto esperado"

Front-end
#1

Ajuda por favor.
estou tentando implementar uma tela com modalbox para upload de arquivo, mas quando dou submit na tela modal, recebo a mensagem de “objeto esperado”

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">






<html>
<head>
<title>adicionaProposta</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="GENERATOR" content="Rational Application Developer">
<link rel='stylesheet' type='text/css' href='css/kit.css' />
		<script type="text/javascript" language="JavaScript" src="js/jquery/jquery-1.4.2.min.js?timestamp=1291133238450"></script>		
		<link type="text/css" rel="stylesheet" href="js/modalbox/modalbox.css" />
		<script type="text/javascript" src="js/ajuda_online/ajuda_online.js?timestamp=1291133238450"></script> 
		<script type="text/javascript" src="js/modalbox/lib/prototype.js?timestamp=1291133238450"></script>
		<script type="text/javascript" src="js/modalbox/lib/scriptaculous.js?timestamp=1291133238450&load=effects"></script>
		<script type="text/javascript" src="js/modalbox/modalbox.js?timestamp=1291133238450"></script>
		<script type='text/javascript' language='JavaScript' src='kitweb.js?timestamp=1291133238450'></script>
		<script type='text/javascript' language='JavaScript' src='validacao.js?timestamp=1291133238450'></script>
		<script type='text/javascript' language='JavaScritp' src='popup_utils.js?timestamp=1291133238450'></script>
		<script type='text/javascript' language='JavaScritp' src='/multicalculo/dwr/interface/UtilidadesDWR.js'></script>
		<script type='text/javascript' language='JavaScritp' src='/multicalculo/dwr.js'></script>
		<script type='text/javascript' language='JavaScritp' src='/multicalculo/dwr/engine.js'></script>
		<script type='text/javascript' language='JavaScritp' src='/multicalculo/js/dwr/engine.js?timestamp=1291133238450'></script>
		<script type='text/javascript' language='JavaScritp' src='/multicalculo/js/dwr/util.js?timestamp=1291133238450'></script>
		<script type="text/javascript" languade="JavaScritp" src="dadosCotSol.js?timestamp=1291133238450"></script>

<script type="text/javascript">

	function AbreObservacoes() {
		Modalbox.show( 'popPesquisaProposta.jsp', {
			overlayClose : false,
			title : "Upload de Arquivo",
			width : 530,
			closeString: "Close window"			
		} );
	}

	function abrir() {  
		window.open('popPesquisaProposta.jsp','page','toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,width=100,height=100');                          
    }   
               
    function setPaginas() {
		document.forms[0].pagAtual.value = 1;
		document.forms[0].pagFinal.value = "";
	}
			
	function consultaProposta() {
		setPaginas();		
		document.forms[0].action = "app?cmd=trataarquivo";  
		document.forms[0].submit();
	}    
    
    function adiciona(){    
    	if(isNaN(document.forms[0].numero.value) ){    
    		   window.alert('O valor desse campo deve ser númerico');
    		   document.forms[0].numero.focus();
   		}else{
   			consultaProposta();
   		}
    }      
	
</script>
	
</head>
<body topmargin="10" rightMargin="0">
	<form target="lista" method="post" action = "app?cmd=trataarquivo" >
	
	<input type="hidden" name="pagAtual" />
	<input type="hidden" name="pagFinal" />	
			
	<input type="hidden" name="cmd" value="">
		<table width="400" border="0" align="center" cellpadding="0" cellspacing="0">
			<tr>
				<td colspan="7">
					<table width="100%" border="0" cellspacing="0" cellpadding="0">
						<tr>
							<td width="2%" height="17" class="img-canto"></td>
							<td width="98%" height="17" class="title-cabeca">Consulta de Propostas para Cancelamento</td>
						</tr>
					</table>				
					<tr  class="cor-tabela">
						<td>
							<input type="radio" name="tipo" value="p" checked >Cod. Proposta
							<input type="radio" name="tipo" value="s">Cod. Proposta Seg.<br>
						</td>						
						<td></td>
						<td></td>
					</tr>
					<tr class="cor-tabela">
						<td align="center"><input type="text" action="" name="numero" size="10"></td>
						
						<td align="center"><input type="button" class="botao80" value="adicionar" name="adicionar" id="adicionar" onclick="adiciona()"></td>
						<td align="center"><input type="button" class="botao80" value="upload" name="upload" onclick="AbreObservacoes()"></td>
											
					</tr>					
				</td>	
			</tr>
		</table>		
	</form>

</body>
</html>

Recebo erro na linha 15 caracter 77
Estou usando websphere

#2