// JavaScript Code for Tate Website
// (c) 2000 Nykris Digital Design Ltd.
// Engineer: Graham Bartram
// Browser ID Utilities
var gAgent = window.navigator.userAgent;
var gAgentVers = parseInt(gAgent.charAt(gAgent.indexOf("/")+1),10);
function is_explorer(){
return gAgent.indexOf("MSIE") > 0;
}
/*Added By iBase Image Systems
*Date: 9/11/2001
*By: Peter Slater and Russell Wicks
*
*/
//This function sets the default value for the browsers status bar
function statusSetter(){
window.defaultStatus = "Tate Gallery";
window.status = "Tate Gallery";
return true;
}
function unset_selection(ID,CHCKOBJ,COOKIE){
var isChecked = CHCKOBJ.checked;
var cookieName = "selection";
switch (COOKIE){
case 0:{
cookieName = "selection";
break;
}
case 1:{
cookieName = "saved";
break;
}
}
if(isChecked){
DeleteCookie(cookieName,null,null,ID);
}
else{
SetCookie(cookieName,ID,null,null,null);
}
}
//function to detect selection or deselection of a particular work
function set_selection(ID,CHCKOBJ){
var isChecked = CHCKOBJ.checked;
if(isChecked){
SetCookie("selection",ID,null,null,null);
}
else{
DeleteCookie("selection",null,null,ID);
}
}
function FixCookieDate (date) {
var base = new Date(0);
var skew = base.getTime();
if (skew > 0)
date.setTime (date.getTime() - skew);
}
function SetCookie(name, value, path, domain, secure) {
var newvalue = (GetCookie(name) != null)?GetCookie(name)+value+"-":value+"-";
document.cookie = name + "=" + newvalue +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
}
function getCookieVal(offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
function CheckCookie(id){
var ids = GetCookie("selection");
if(ids.indexOf(id)>-1){
return true;
}
else{
return false;
}
}
function DeleteCookie(name,path,domain,ID) {
var ids = removeSelection(GetCookie(name),ID);
if (GetCookie(name)) {
document.cookie = name + "=" + ids +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}
function removeSelection(ids,id){
var sId = new String(id);
var startIndex = ids.indexOf(id);
var endIndex = startIndex+sId.length;
var newids;
switch(startIndex){
// The id being looked for is at the start of the string.
case 0:{
newids = ids.substring(endIndex+1, ids.length);
break;
}
// The id being looked for is somewhere in the middle.
default:{
newids = ids.substring(0, startIndex) + ids.substring(endIndex+1, ids.length);
break;
}
}
return newids;
}
//End of iBase Image Systems code block.
// Flash and Image Utilities
// Check whether Flash is installed on the user's computer and create a cookie with the
// result. The cookie has four possible values which tell other routines what to do when
// asked to insert a Flash movie:
// "img" - write out tag instead
// "swf" - write out