function modifyURLs() {
            // loop through the links array and add URL parms
            var url = "";
            for(i=0; i<document.links.length; i++) {
                        url = document.links[i].href;
                        if (url.indexOf("Expand")>0 || url.indexOf("Collapse")>0) {  
                                  document.links[i].href += "&vb=" + document.forms[0].loadedVB.value;  
                        }                                   
            }
}