/*******************************************************************************
*  ruthsarian_utilities.js : 2005.06.28
* -----------------------------------------------------------------------------
*  A group of useful JavaScript utilities that can aid in the development
*  of webpages.
*******************************************************************************/

/* event_attach() takes care of attaching event handlers (functions) to events. 
 * this simplifies the process of attaching multiple handlers to a single event
 *
 * NOTE: the onload stack is executed in a LIFO manner to mimic 
 *       IE's window.attachEvent function. However, Opera also has its own
 *       window.attachEvent function which executes the onload stack in a 
 *       FIFO manner. FIFO is better, but IE has a larger user base, so
 *       LIFO is the way we go.
 */
function event_attach( event , func )
{
if ( window.attachEvent )
{
window.attachEvent( event , func );
}
else
{
if ( ( typeof( func ) ).toLowerCase() != 'function' )
{
return;
}
if ( ( typeof( document.event_handlers ) ).toLowerCase() == 'undefined' )
{
document.event_handlers = new Array();
}
if ( ( typeof( document.event_handlers[ event ] ) ).toLowerCase() == 'undefined' )
{
document.event_handlers[ event ] = new Array();
}
if ( ( typeof( eval( 'window.' + event ) ) ).toLowerCase() != 'function' )
{
eval( 'window.' + event + ' = function () { if ( ( typeof( document.event_handlers[ \'' + event + '\' ] ) ).toLowerCase() != \'undefined\' ) { for ( i = document.event_handlers[ \'' + event + '\' ].length - 1 ; i >= 0  ; i-- ) { document.event_handlers[ \'' + event + '\' ][ i ](); } } } ' );
}
document.event_handlers[ event ][ document.event_handlers[ event ].length ] = func;
}
}

/* Browser Detect  v2.1.6
 * documentation: http://www.dithered.com/javascript/browser_detect/index.html
 * license: http://creativecommons.org/licenses/by/1.0/
 * code by Chris Nott (chris[at]dithered[dot]com)
 *
 * modified to include Dreamcast
 */
function browser_detect() 
{
var ua= navigator.userAgent.toLowerCase(); 
this.isGecko= (ua.indexOf('gecko') != -1 && ua.indexOf('safari') == -1);
this.isAppleWebKit= (ua.indexOf('applewebkit') != -1);
this.isKonqueror= (ua.indexOf('konqueror') != -1); 
this.isSafari= (ua.indexOf('safari') != - 1);
this.isOmniweb= (ua.indexOf('omniweb') != - 1);
this.isDreamcast= (ua.indexOf("dreamcast") != -1);
this.isOpera= (ua.indexOf('opera') != -1); 
this.isIcab= (ua.indexOf('icab') != -1); 
this.isAol= (ua.indexOf('aol') != -1); 
this.isIE= (ua.indexOf('msie') != -1 && !this.isOpera && (ua.indexOf('webtv') == -1)); 
this.isMozilla= (this.isGecko && ua.indexOf('gecko/') + 14 == ua.length);
this.isFirebird= (ua.indexOf('firebird/') != -1);
this.isNS= ((this.isGecko) ? (ua.indexOf('netscape') != -1) : ((ua.indexOf('mozilla') != -1) && !this.isOpera && !this.isSafari && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1)));
this.isIECompatible= ((ua.indexOf('msie') != -1) && !this.isIE);
this.isNSCompatible= ((ua.indexOf('mozilla') != -1) && !this.isNS && !this.isMozilla);
this.geckoVersion= ((this.isGecko) ? ua.substring((ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14)) : -1);
this.equivalentMozilla= ((this.isGecko) ? parseFloat(ua.substring(ua.indexOf('rv:') + 3)) : -1);
this.appleWebKitVersion= ((this.isAppleWebKit) ? parseFloat(ua.substring(ua.indexOf('applewebkit/') + 12)) : -1);
this.versionMinor= parseFloat(navigator.appVersion); 
if (this.isGecko && !this.isMozilla) {
this.versionMinor = parseFloat(ua.substring(ua.indexOf('/', ua.indexOf('gecko/') + 6) + 1));
}
else if (this.isMozilla) {
this.versionMinor = parseFloat(ua.substring(ua.indexOf('rv:') + 3));
}
else if (this.isIE && this.versionMinor >= 4) {
this.versionMinor = parseFloat(ua.substring(ua.indexOf('msie ') + 5));
}
else if (this.isKonqueror) {
this.versionMinor = parseFloat(ua.substring(ua.indexOf('konqueror/') + 10));
}
else if (this.isSafari) {
this.versionMinor = parseFloat(ua.substring(ua.lastIndexOf('safari/') + 7));
}
else if (this.isOmniweb) {
this.versionMinor = parseFloat(ua.substring(ua.lastIndexOf('omniweb/') + 8));
}
else if (this.isOpera) {
this.versionMinor = parseFloat(ua.substring(ua.indexOf('opera') + 6));
}
else if (this.isIcab) {
this.versionMinor = parseFloat(ua.substring(ua.indexOf('icab') + 5));
}
this.versionMajor= parseInt(this.versionMinor); 
this.isDOM1= (document.getElementById);
this.isDOM2Event= (document.addEventListener && document.removeEventListener);
this.mode= document.compatMode ? document.compatMode : 'BackCompat';
this.isWin= (ua.indexOf('win') != -1);
this.isWin32= (this.isWin && (ua.indexOf('95') != -1 || ua.indexOf('98') != -1 || ua.indexOf('nt') != -1 || ua.indexOf('win32') != -1 || ua.indexOf('32bit') != -1 || ua.indexOf('xp') != -1));
this.isMac= (ua.indexOf('mac') != -1);
this.isUnix= (ua.indexOf('unix') != -1 || ua.indexOf('sunos') != -1 || ua.indexOf('bsd') != -1 || ua.indexOf('x11') != -1)
this.isLinux= (ua.indexOf('linux') != -1);
this.isNS4x= (this.isNS && this.versionMajor == 4);
this.isNS40x= (this.isNS4x && this.versionMinor < 4.5);
this.isNS47x= (this.isNS4x && this.versionMinor >= 4.7);
this.isNS4up= (this.isNS && this.versionMinor >= 4);
this.isNS6x= (this.isNS && this.versionMajor == 6);
this.isNS6up= (this.isNS && this.versionMajor >= 6);
this.isNS7x= (this.isNS && this.versionMajor == 7);
this.isNS7up= (this.isNS && this.versionMajor >= 7);
this.isIE4x= (this.isIE && this.versionMajor == 4);
this.isIE4up= (this.isIE && this.versionMajor >= 4);
this.isIE5x= (this.isIE && this.versionMajor == 5);
this.isIE55= (this.isIE && this.versionMinor == 5.5);
this.isIE5up= (this.isIE && this.versionMajor >= 5);
this.isIE6x= (this.isIE && this.versionMajor == 6);
this.isIE6up= (this.isIE && this.versionMajor >= 6);
this.isIE4xMac= (this.isIE4x && this.isMac);
}

/* Opacity Displayer, Version 1.0 - http://old.alistapart.com/stories/pngopacity/
 * Copyright Michael Lovitt, 6/2002.
 */
function opacity( strId , strPath , intWidth , intHeight , strClass , strAlt )
{
if ( document.pngAlpha )
{
document.write( '<div style="height:'+intHeight+'px;width:'+intWidth+'px;filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\''+strPath+'.png\', sizingMethod=\'scale\')" id="'+strId+'" class="'+strClass+'"></div>' );
}
else if ( document.pngNormal )
{
document.write( '<img src="'+strPath+'.png" width="'+intWidth+'" height="'+intHeight+'" name="'+strId+'" border="0" class="'+strClass+'" alt="'+strAlt+'" />' );
}
else if ( document.layers )
{
return( '<img src="'+strPath+'.gif" width="'+intWidth+'" height="'+intHeight+'" name="'+strId+'" border="0" class="'+strClass+'" alt="'+strAlt+'" />' );
}
else
{
document.write( '<img src="'+strPath+'.gif" width="'+intWidth+'" height="'+intHeight+'" name="'+strId+'" border="0" class="'+strClass+'" alt="'+strAlt+'" />' );
}
return( '' );
}
function opacity_init()
{
var browser = new browser_detect();
document.pngAlpha = false;
document.pngNormal = false;
document.strExt = ".gif";

if ( ( browser.isIE55 || browser.isIE6up ) && browser.isWin32 )
{
document.pngAlpha = true;
document.strExt = ".png";
}
else if ( 
( browser.isGecko ) || 
( browser.isIE5up && browser.isMac ) || 
( browser.isOpera && browser.isWin && browser.versionMajor >= 6 ) || 
( browser.isOpera && browser.isUnix && browser.versionMajor >= 6 ) || 
( browser.isOpera && browser.isMac && browser.versionMajor >= 5 ) || 
( browser.isOmniweb && browser.versionMinor >= 3.1 ) || 
( browser.isIcab && browser.versionMinor >= 1.9 ) || 
( browser.isWebtv ) || 
( browser.isDreamcast ) 
)
{
document.pngNormal = true;
document.strExt = ".png";
}
}

/* handler for Netscape Navigator clients that screw up the display
 * of CSS pages when reloaded
 */
function NN_reloadPage( init )
{
if ( init == true ) with ( navigator )
{
if ( ( appName == "Netscape" ) && ( parseInt ( appVersion ) == 4 ) )
{
document.NN_pgW = innerWidth;
document.NN_pgH = innerHeight;
event_attach ( 'onresize' , NN_reloadPage );
}
}
else if ( innerWidth != document.NN_pgW || innerHeight != document.NN_pgH )
{
location.reload();
}
}

/* Min Width v1.1.3 by PVII-www.projectseven.com
 * http://www.projectseven.com/tutorials/css/minwidth/index.htm
 *
 * modified for readability and ability to limit application to
 * IE only so CSS min-width property may be used by compliant
 * browsers.
 *
 * NOTE: horizontal spacing (margins, padding, borders) set in
 *       % values may cause IE to crash when using this script.
 */
function set_min_width( obj_name , min_width , ieOnly )
{
if ( ( typeof( ieOnly ) ).toLowerCase() == 'undefined' )
{
ieOnly = true;
}
if ( ieOnly == false || ( document.getElementById && navigator.appVersion.indexOf( "MSIE" ) > -1 && !window.opera ) )
{
document.min_width_obj_name = obj_name;
document.min_width_size = min_width;
document.resizing = false;
event_attach( 'onload' , control_min_width );
event_attach( 'onresize' , control_min_width );
}
}
function control_min_width()
{
var cw , w , pl , pr , ml , mr , br , bl , ad , theDiv = document.min_width_obj_name;
var g = document.getElementById( theDiv );
w = parseInt(document.min_width_size);
if ( g && document.body && document.body.clientWidth )
{
gs = g.currentStyle;
cw = parseInt( document.body.clientWidth );
pl = parseInt( gs.paddingLeft );
pr = parseInt( gs.paddingRight );
ml = parseInt( gs.marginLeft );
mr = parseInt( gs.marginRight );
bl = parseInt( gs.borderLeftWidth );
br = parseInt( gs.borderRightWidth );
ml = ml ? ml : 0;
mr = mr ? mr : 0;
pl = pl ? pl : 0;
pr = pr ? pr : 0;
bl = bl ? bl : 0;
br = br ? br : 0;
ad = pl + pr + ml + mr + bl + br;
if ( cw <= w )
{
w -= ad;
g.style.width = w + "px";
}
else
{
g.style.width = "auto";
}
}
}

/* Cookie API  v1.0.1
 * documentation: http://www.dithered.com/javascript/cookies/index.html
 * license: http://creativecommons.org/licenses/by/1.0/
 * code (mostly) by Chris Nott (chris[at]dithered[dot]com)
 */
function setCookie( name, value, expires, path, domain, secure )
{
 var curCookie = name + "=" + escape(value) +
((expires) ? "; expires=" + expires.toGMTString() : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
document.cookie = curCookie;
}
function getCookie( name )
{
var dc = document.cookie;
var prefix = name + "=";
var begin = dc.indexOf( "; " + prefix );
if ( begin == -1 )
{
begin = dc.indexOf(prefix);
if (begin != 0) return null;
}
else
{
begin += 2;
}
var end = document.cookie.indexOf( ";", begin );
if ( end == -1 )
{
end = dc.length;
}
return unescape(dc.substring(begin + prefix.length, end));
}
function deleteCookie( name, path, domain )
{
var value = getCookie( name );
if ( value != null )
{
document.cookie = name + "=" + 
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
return value;
}

/* font size functions operate on the body element's
 * style and defines sizes in percentages. because
 * the default font size is set to 0 in the array,
 * the first value in the font_sizes array should
 * _ALWAYS_ be 100.
 *
 *var font_sizes = new Array( 100, 110, 120 );
 *var current_font_size = 0;
 *event_attach( 'onload' , loadFontSize );
 */
function loadFontSize ()
{
current_font_size = parseInt( '0' + getCookie ( "font_size" ) );
setFontSize ( current_font_size );
}
function setFontSize( size )
{
if( size >= 0 && size < font_sizes.length )
{
current_font_size = size;
}
else if( ++current_font_size >= font_sizes.length )
{
current_font_size = 0;
}
if ( document.body )
{
document.body.style.fontSize = font_sizes[ current_font_size ] + '%';
setCookie( "font_size" , current_font_size );
}
}

/* standard trim function to remove leading and trailing 
 * whitespace from a given string
 */
function trim( str )
{
   return str.replace(/^\s*|\s*$/g,"");
}

/* stylesheets should be defined in the HTML via a LINK tag
 * and rel attribute set to "alternate stylesheet". the title
 * attribute is then set in the format of "title : group"
 * this function will disable all but the stylesheet specified
 * by title in the group specified by group.
 *
 * Based on code by Paul Sowden
 * http://www.alistapart.com/articles/alternate/
 */
function setActiveStyleSheet( title , group )
{
var i, a, b, g, t;
if ( !title || !group )
{
return;
}
for ( i = 0; ( a = document.getElementsByTagName( "link" )[ i ] ); i++ ) 
{
if ( a.getAttribute( "rel" ).indexOf( "style" ) != -1 && a.getAttribute( "title" ) )
{
b = ( a.getAttribute( "title" ) ).split( ":" );
g = trim( b[ b.length - 1 ] );
if ( g.toLowerCase() == group.toLowerCase() )
{
a.disabled = true;
t = trim( ( a.getAttribute( "title" ) ).substring( 0, a.getAttribute( "title" ).length - b[ b.length - 1 ].length - 1 ) );
if( t.toLowerCase() == title.toLowerCase() )
{
a.disabled = false;
}
}
setCookie( "style_" + g.toLowerCase() , title );
}
}
}
function getPreferredStylesheet ( group )
{
return ( getCookie ( "style_" + group ) );
}