<!--

var darkened_pics = new Array();
var lighted_pics = new Array();


function preloadButtonSet(num,dark,light) {
 darkened_pics[num] = new Image();
 darkened_pics[num].src = dark;
 lighted_pics[num] = new Image();
 lighted_pics[num].src = light;
}

preloadButtonSet(0,"images/about_berk_off.gif","images/about_berk_on.gif");
preloadButtonSet(1,"images/cartoon_collections_off.gif","images/cartoon_collections_on.gif");
preloadButtonSet(2,"images/childrens_books_off.gif","images/childrens_books_on.gif");
preloadButtonSet(3,"images/favorite_strips_off.gif","images/favorite_strips_on.gif");
preloadButtonSet(4,"images/flaweddogs_off.gif","images/flaweddogs_on.gif");
preloadButtonSet(5,"images/bibliography_off.gif","images/bibliography_on.gif");
preloadButtonSet(6,"images/talk_with_berk_off.gif","images/talk_with_berk_on.gif");
preloadButtonSet(7,"images/news_events_off.gif","images/news_events_on.gif");
preloadButtonSet(8,"images/resources_links_off.gif","images/resources_links_on.gif");
preloadButtonSet(9,"images/onlinestore_off.gif","images/onlinestore_on.gif");
preloadButtonSet(10,"images/homeimage1_off.jpg","images/homeimage1_on.jpg");
preloadButtonSet(11,"images/homeimage2_off.jpg","images/homeimage2_on.jpg");
preloadButtonSet(12,"images/homeimage3_off.jpg","images/homeimage3_on.jpg");
preloadButtonSet(13,"images/homeimage4_off.jpg","images/homeimage4_on.jpg");
preloadButtonSet(14,"images/opus_returns_off.gif","images/opus_returns_on.gif");
preloadButtonSet(15,"images/write_berkeley_off.gif","images/write_berkeley_on.gif");


function lighten(num) {
 if (document.images)
  eval("document.button"+num+".src = lighted_pics["+num+"].src;");
 return false;
}
function darken(num) {
 if (document.images)
  eval("document.button"+num+".src = darkened_pics["+num+"].src;");
 return false;
}

//->