function CheckRequiredFields(theForm)
{
   for(i=1; i<CheckRequiredFields.arguments.length; i++)
        if(theForm.elements[CheckRequiredFields.arguments[i]].value==""){
            alert("Um campo requerido năo foi informado. Favor preenchê-lo!");
            theForm.elements[CheckRequiredFields.arguments[i]].focus();
            return false;
        }
   return true;
}

function CheckForm(theForm){
     if(CheckRequiredFields(theForm, 0, 1, 2, 3, 4, 5, 6, 7))
          return true;
  return false;
}