var strUser = ""
function userEffect(obj, boo) {

    if (strUser == "") {
        strUser = obj.value;
    }
    if (boo == undefined) {
        if (obj.value.indexOf(strUser) != -1) {
            obj.value = "";
        }
    } else {
        if (obj.value == "") {
            obj.value = strUser;
        }
    }
}