How can u change the port settings on yahoo IM to make it work in a firewalled network like my work network?

My work network is protected by firewall and what not and I am unable to us Yahoo IM at work. I understand that if you change the port Nos u will be able to log into yahoo IM.what are the prot nos to be changed to and and please give step by step instructions.I am not an expert. Just a simple dude who would like to keep in touch at work as well..cheers.How can u change the port settings on yahoo IM to make it work in a firewalled network like my work network?
If they've blocked it, then you could find yourself in trouble for using it (since IM can often be used to copy files, so someone could send customer information, company documents, etc out to a friend).



Some firewalls will only allow port 80 and 443 (but it's your responsibility if they give you written warnings or worse).How can u change the port settings on yahoo IM to make it work in a firewalled network like my work network?
I know this isn't what you want to hear, but there is an increasing problem with data protection, as staff just don't get that they are a liability.

The reason some programs and sites are blocked is because they pose a threat to the security of the system where you work (viruses, trojans etc) and because they're a threat to peoples confidential info that you work with.



You wouldn't like it if your ID was nicked and thousands stolen on credit cards in your name because some muppet just had to chat with their mates while they were at work, would you? Thats why you are expected to take responsibility for what you're doing!