function clear_field(field)
{
    if (field.value==field.defaultValue)
    {
        field.value=''
    }
}

function check_field(field)
{
    if (field.value=='' ||
    field.value==' ')
    {
        field.value=field.defaultValue
    }
}

function validate_form()
{

    if (document.contact_frm.zoom_query.value==document.contact_frm.zoom_query.defaultValue ||
    document.contact_frm.zoom_query.value.indexOf(' ',0)==0)
    {
        alert('\nNessun nome inserito.')
        document.contact_frm.zoom_query.select()
        document.contact_frm.zoom_query.focus()
        return false
    }

    
}