function affCache(idpr)
{
        var i;
	var pr = document.getElementById(idpr);

        var divArr = document.getElementsByTagName("div");

        for (i = 0; i < divArr.length; i++) {

            if (divArr[i].id.substring(0, 2) == "pr") {
               divArr[i].style.display = "none";
            }
        }

        pr.style.display = "";

}