//The following variables are used in the preload function
var suffix = new Array('a','i','o'); //Starts new array to preload images; 1st variable is the active state, 2nd variable is the inactive state, 3rd variable is the on state (if needed)
var loaded = false; //Globally sets the loaded var to false so rollovers do not function until loaded
var uExt = 'gif'; //The file extension of the rollover graphics for the Uroll function
//var uPath = '';This is the path where the top nav rollover graphics live - it is set on each page
//This function preloads rollover images for the dropNav function
function uPreload(){
if(document.images){
var uArglen = arguments.length;
for(var i = 0; i < uArglen; i++){
var uArg = arguments[i];
var uSufLen = suffix.length;
for(j = 0; j < uSufLen; j++){
var uSuf = suffix[j];
uNew = uArg + uSuf + ' = new Image();'; eval(uNew);
uSrc = uArg + uSuf + '.src = \'' + uPath + 'images' + '/' + uArg + uSuf + '.' + uExt + '\';';
eval(uSrc);
}
}
loaded = true;
}
}
//This function is for two rollover images and showing/hiding a div layer
//dnDivstate is the state (hidden or visible) of the div layer mentioned on the next line
//dnDiv is the div layer to be hidden or shown
//dnName is name of 1st graphic
//dndName is name of 2nd graphic
//dnState is the rollover state of both graphics - active (a), inactive(i) or on(o)
//uWstat is the browser window status message
function dropNav(dnDivstate,dnDiv,dnName,dndName,dnState,dnWstat) {
isNS4 = (document.layers) ? true : false;
isIE4 = (document.all && !document.getElementById) ? true : false;
isIE5 = (document.all && document.getElementById) ? true : false;
isNS6 = (!document.all && document.getElementById) ? true : false;
if (isIE4) {
var dnNavlayer = eval('document.all.'+dnDiv);
dnNavlayer.style.visibility = dnDivstate;
if(document.images && loaded) {
document.images[dnName].src = self[dnName + dnState].src;
if(dndName!='x') {
document.images[dndName].src = self[dndName + dnState].src;
}
dnWstat = dnWstat.replace('|',"'");
window.status = dnWstat;
}
}else if (isNS4) {
var dnNavlayer = eval('document.layers.'+dnDiv);
dnNavlayer.visibility = dnDivstate;
if(document.images && loaded) {
document.images[dnName].src = self[dnName + dnState].src;
if(dndName!='x') {
dnNavlayer.document.images[dndName].src = self[dndName + dnState].src;
}
dnWstat = dnWstat.replace('|',"'");
window.status = dnWstat;
}
}else if (isNS6 || isIE5) {
var dnNavlayer = eval('document.getElementById'+'("'+dnDiv+'")');
dnNavlayer.style.visibility = dnDivstate;
if(document.images && loaded) {
document.images[dnName].src = self[dnName + dnState].src;
if(dndName!='x') {
document.images[dndName].src = self[dndName + dnState].src;
}
dnWstat = dnWstat.replace('|',"'");
window.status = dnWstat;
}
}
}
// This function preloads all of the graphics for the top navigation
function onLoad() {
uPreload('resources','collection','services','news','information','search','ask','wadc','foia','terrorism','sudocs','afghanistan','imagegallery','federal','state','international','instruction','microfichescanning','whatsnew','aboutcollection','hours','staff','facilities','policies','mission','credits');
}
window.onload = onLoad;
// This function builds the dropdown menus for the top nav
function buildNav(){
//
//
document.write(' ');
//
//
document.write(' ');
//
//
document.write(' ');
document.write('
');
document.write(' ');
document.write('  | ');
document.write('
');
document.write(' ');
document.write('  | ');
document.write('
');
document.write(' ');
document.write('  | ');
document.write('
');
document.write('
');
document.write('
');
document.write('
');
document.write(' ');
document.write('  | ');
document.write('
');
document.write(' ');
document.write(' | ');
document.write('
');
document.write('
');
document.write('
