var Search = document.searchBox.elements["q"];
Search.onfocus=function() {
    var fn = document.searchBox.elements["q"];
    if (fn.value=="Search for a title or author") fn.value="";
};
Search.onblur=function() {
    var fn = document.searchBox.elements["q"];
    if (fn.value=="") fn.value="Search for a title or author";
};