Tacking software

[mutale]

I am writing a Tacking software that should track converstion with sevral sites.
when a User click a banner it goes to a PHP file located on my server and place a cookie at the client.

At the other site I placed an IMG tag at the convertion page that leads to (at the src) to another PHP file that read the cookie write something to my DB and then erase the cookie.
Now it doesnt work, for some reson

[4xz]

Having a bit of trouble understanding your English, but I think the problem is the fact that cookies can only be read (and manipulated) by the same server that sent them.

[mutale]

I am writing a Tacking software that should track converstion with sevral sites.
when a User click a banner it goes to a PHP file located on my server and place a cookie at the client.
At the other site I placed an IMG tag at the convertion page that leads to (at the src) to another PHP file that read the cookie write something to my DB and then erase the cookie.
Now it doesnt work, for some reson I cant read the cookie.
Please help me find a way to do it, I cant place anyting but a IMG tag on the other sites that I need to count the convertions at.