Hello Welcome to the Forums,
I think you are done with SharePoint submit right? Sending email with attachment here is the solution,
Initially submitting to SharePoint you have to send the mail to approver1 with attachment. Before submitting the form and sending to mail approver1 you have to set the value in main data source. For this you have to add one new field ‘SubmitApprover1' and data type is Boolean. By default it should be false. While submitting to Approver1, we have to set ‘true' for this ‘SubmitApprover1'field value.
For next opens this form you have to check this field values is true or false. If this field value is false then we have to send the form to Approver1 otherwise Approver2.
In IP2007 you have the option of having the view in the body or the attachment. It is a trust issue for the email acknowledgement. So that viruses cannot send email without the user's consent. You would need to use code and full-trust to eliminate the email pop-up and send button.