// the functions in this file require the supplementary library lib.js

// These defaults should be changed the way it best fits your site
var _POPUP_FEATURES = '';
  var w=645;                        /* popup window width*/
  var h=355;                        /* popup window height*/
 var l=(screen.width-w)/2;         /*this centers horizontally*/
  var t=(screen.height-h)/2; 

  var featurese="left="+l+",top="+t+"";
  
function raw_popup(url, target, features) {
    // pops up a window containing url optionally named target, optionally having features
    if (isUndefined(features)) features = _POPUP_FEATURES + ',menubar';
    if (isUndefined(target  )) target   = '_blank';
    var theWindow = window.open(url, target, featurese + features);
    theWindow.focus();
    return theWindow;
}
function raw_popup_t(url, target, features) {
    // pops up a window containing url optionally named target, optionally having features
    if (isUndefined(features)) features = _POPUP_FEATURES + ',menubar';
    if (isUndefined(target  )) target   = '_blank';
    var theWindow = window.open(url, target, features);
    theWindow.focus();
    return theWindow;
}
function raw_popup_tl(url, target, features) {
    // pops up a window containing url optionally named target, optionally having features
    if (isUndefined(features)) features = _POPUP_FEATURES + ',menubar';
    if (isUndefined(target  )) target   = '_blank';
    var theWindow = window.open(url, target, features);
    theWindow.focus();
    return theWindow;
}

function link_popup_tl(src, features) {

    // to be used in an html event handler as in: <a href="..." onclick="link_popup(this,...)" ...
    // pops up a window grabbing the url from the event source's href
	
    return raw_popup_tl(src.getAttribute('href'), src.getAttribute('target') || '_blank', features + ',menubar');
}

function link_popup(src, features) {
    // to be used in an html event handler as in: <a href="..." onclick="link_popup(this,...)" ...
    // pops up a window grabbing the url from the event source's href
    return raw_popup(src.getAttribute('href'), src.getAttribute('target') || '_blank', features + ',menubar');
}
function link_popup_minus(src, features) {
    // to be used in an html event handler as in: <a href="..." onclick="link_popup(this,...)" ...
    // pops up a window grabbing the url from the event source's href
    return raw_popup_t(src.getAttribute('href'), src.getAttribute('target') || '_blank', features + ',menubar');
}
function event_popup(e) {
    // to be passed as an event listener
    // pops up a window grabbing the url from the event source's href
    link_popup(e.currentTarget);
    e.preventDefault();
}

function event_popup_features(features) {
    // generates an event listener similar to event_popup, but allowing window features
    return function(e) { link_popup(e.currentTarget, features); e.preventDefault() }
}