Try to write with Javascript,, (just for the test),, I have some problème with the PHP cookies. Possible IE reject the cookies?
<!--
function SetCookie (name,value,expires,path,domain,secure) {
document.cookie = name + "=" + escape (value) +
((expires) ? "; expires=" + expires.toGMTString() : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
}
SetCookie("IMcook","tot");
--></script>