/* SCRIPTS.JS -- JavaScript utilities for travelogues.net */
/* ------------------------------------------ URL redirection routines --------------------------------------------- */
/* redirect_index(): If the browser has JavaScript, open JS-enabled index_js.htm. If a sub-page was opened and the user was
redirected to index.htm, then pass on the name of the entry page to index_js.htm so that we can open that page inside the frame.
*/
function redirect_index()
{
var query = location.search.substring(1);
var full_url = "index_js.htm";
if( query.length > 0 )
full_url += ("?" + query);
this.location.replace( full_url );
}
/* set_frame(): Called by index_js.htm: uses internal HTML to modify it. Sets up the frame, and if the entry point was a sub-page,
sets that page as the default page in the content frame so that the user goes straight there.
*/
function set_frame()
{
var return_value;
var args = new Object;
var content_page, requested_page;
args = getArgs();
requested_page = args["page"];
/* Still dangerous to call contents_js.htm, but who would do that, and why?? */
if( (args["page"] == null) || (requested_page == "contents.htm") || (requested_page == "contents_js.htm") )
content_page = "intro.htm"
else
content_page = requested_page;
/* For some reason multiple write statements don't work. So, compile a string and write once */
return_value="";
document.write( return_value );
}
/* get_frame(): If someone tuned in on an individual page, redirect them to the main frame */
function get_frame()
{
var parent_href, this_page, index_page, pos;
this_page = this.location.href;
parent_href = parent.location.href.toUpperCase();
if( parent_href.indexOf( "INDEX.HTM" ) < 0 && parent_href.indexOf( "INDEX_JS.HTM" ) < 0 )
{
/* If we got here by directory, not specifying a file */
if( parent_href.charAt( parent_href.length-1 ) != '/' )
{
this_page = strip_dir( this_page );
index_page = "index.htm" + "?page=" + this_page;
this.location.href = index_page;
}
}
}
/* Parses a query string. Taken from JavaScript, The Definitive Guide, O'Reilly */
function getArgs()
{
var args = new Object;
var query = location.search.substring(1);
var pairs = query.split(",");
for( var i = 0; i < pairs.length; i++ )
{
var pos = pairs[i].indexOf('=');
if( pos == -1 )
continue;
var argname = pairs[i].substring( 0, pos );
var value = pairs[i].substring( pos + 1);
args[argname] = unescape(value);
}
return args;
}
/* strip_dir(): Gets the name of a page, stripping out the directory path */
function strip_dir( full_path )
{
var pos, return_value;
pos = full_path.lastIndexOf("/")
return_value = full_path.substr( pos >=0 ? pos+1 : 0 );
return (return_value);
}
/* ---------------------------------------------- Navigation routines ---------------------------------------------------- */
/* nav_buttons() -- lays out 3 buttons on the content pages: prior, related photos or narrative, next */
function nav_buttons( position, page_type, date_string, last_link, related_link, next_link )
{
var ret_val;
var alignment;
var table_width;
var button_percent;
var button_width=75;
var button_height=18;
var buttons = new Array();
var button_active = new Array();
var alt_text = new Array();
var actions = new Array();
var i;
/* Set up the table positioning and proportions */
if( position == "header" )
alignment = "right";
else
alignment = "center";
ret_val = '';
ret_val += '
0 )
ret_val += 'width = "100%"';
ret_val+='>';
/* Add one row */
ret_val += '';
/* If there's a date string, we need an extra column */
if( position == "header" && date_string.length > 0 )
{
/* Force maximum width by making col 100% */
ret_val += '| ';
ret_val += date_string;
ret_val += ' | ';
button_percent = "12%";
}
else
button_percent = "33%";
/* --------- Choose button graphics and alt text, depending on what type of page ------------- */
/* Determine which buttons are active, choose the graphic for previous and next */
button_active[0] = (last_link.length==0) ? false : true;
button_active[1] = (related_link.length==0) ? false : true;
button_active[2] = (next_link.length==0) ? false : true;
buttons[0]= button_active[0] ? 'buttons/previous.gif' : 'buttons/previous_dim.gif' ;
buttons[2]= button_active[2] ? 'buttons/next.gif' : 'buttons/next_dim.gif';
/* Set the alt text, choose 'related' graphic according to page type */
if(page_type == "photos")
{
alt_text[0] = "Previous photo sheet";
alt_text[1] = "Related narrative";
alt_text[2] = "Next photo sheet";
buttons[1]= button_active[1] ? 'buttons/narrative.gif' : 'buttons/narrative_dim.gif';
}
else
{
alt_text[0] = "Previous narrative";
alt_text[1] = "Related photos";
alt_text[2] = "Next narrative";
buttons[1]= button_active[1] ? 'buttons/photos.gif' : 'buttons/photos_dim.gif';
}
/* Put links in an array for FORM actions */
actions[0] = last_link;
actions[1] = related_link;
actions[2] = next_link;
/* Draw the buttons */
for( i=0; i < 3; i++ )
{
if (button_active[i])
{
ret_val += '';
ret_val +='';
ret_val += ' | ';
}
else
{
ret_val+= '';
ret_val+= '![' + alt_text[i] + '](' + buttons[i] + ') ';
}
}
ret_val += ' |
';
ret_val += '
';
ret_val += '
';
var body_end = '';
var small_photo_height = photo_obj.height;
var small_photo_width = photo_obj.width;
var big_photo_width;
var big_photo_height;
var window_height;
var window_width;
var window_size;
var window_border = 20;
var enlargement;
var big_photo_x;
var big_photo_y;
enlargement=1+(2/3);
/* Replace "images" directory name with the other. NB - not foolproof if a file name has
the word "images" in it!
*/
big_photo_name=photo_obj.src;
big_photo_name = big_photo_name.replace( regExpr, big_image_dir );
big_photo_x = Math.round(small_photo_width*enlargement);
big_photo_y = Math.round(small_photo_height*enlargement);
big_photo_height = 'height="' + big_photo_y + '"';
big_photo_width = 'width="' + big_photo_x + '"';
window_height = big_photo_y + window_border;
window_width = big_photo_x + window_border;
if( window_height >= screen.availHeight )
window_height = screen.availHeight;
if( window_width >= screen.availWidth )
window_width = screen.availWidth;
window_size = "height=" + window_height + ","
+ "width=" + window_width;
var big_photo_format = '
' ;
photowindow = window.open( "", "thewindow",
"scrollbars,resizable," + window_size+",screenX=0,screenY=0" );
/* In case the window was already open, move back to origin and redo, in case we go
between portrait and landscape. Netscape does OK without these lines, and
freezes when they're in
*/
if( navigator.appName != "Netscape" )
{
photowindow.resizeTo( window_width, window_height );
photowindow.moveTo( 0, 0 );
}
photowindow.document.write(body_begin+big_photo_format+body_end);
photowindow.document.close();
/* photowindow.style.cursor="default"; */
photowindow.focus();
}
/* Rollover functions from Dreamweaver: used on the home page */
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i