Add uploads to a Contact Form

I have a html/php contact form that includes CAPTCHA and various other facilities. I would like a file upload or attachment facility adding to the form? so that anyone sending a message can attached a jpg image ONLY. Please bear in mind that whilst the contact form will (generally) be located on my server there may be several forms, all? on different domains, being sent to different mail boxes so the whole operation must be contained within the domain folder. The form and upload/attachment feature must be 100% secure. I will install the contact form at a location where the coder can test the script and also provide the coder with an email account if necessary. ## Deliverables * * *This broadcast message was sent to all bidders on Tuesday Jun 10, 2008 11:20:39 AM: Thank you for your interest in this job. In the brief summary I said "The form and upload/attachment feature must be 100% secure." The word "secure" was not the right word, I should have said "safe" as in being free from any virus or malware. Please confirm how you would propose to ensure that any attachments will be screened for virus, malware or executable content. Thank you Mike