Run a JavaScript in Webbrowser with Delphi

I created a robot in Delphi to open a website and automatically include the data.

I'm having trouble calling a JavaScript routine that has this site, as below:

<script type="text/javascript">
function prepararInclusaoItem(id) {
    myForm = document.getElementById('faturaForm');
    myForm.action='faturamentoPrepararInclusaoItem.do';
    myForm.id.value = id;
}
function excluirItem(codigo) {
    if(confirm('Deseja realmente excluir este Item de Pagamento?')) {
        navegarPara('ExcluirItem', codigo);
    }
    return false;
}
</script>

And to access the registry has the routine that calls the script: