// S5 slides.js -- released under CC by-sa 2.0 license
//
// Please see http://www.meyerweb.com/eric/tools/s5/credits.html for information 
// about all the wonderful and talented contributors to this code!

var snum = 0;
var smax = 1;
var undef;
var slcss = 1;
var isIE = navigator.appName == 'Microsoft Internet Explorer' ? 1 : 0;
var isOp = navigator.userAgent.indexOf('Opera') > -1 ? 1 : 0;
var isGe = navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('Safari') < 1 ? 1 : 0;
var slideCSS = document.getElementById('slideProj').href;

function isClass(object, className) {
	 return (object.className.search('(^|\\s)' + className + '(\\s|$)') != -1);
}

function GetElementsWithClassName(elementName,className) {
	 var allElements = document.getElementsByTagName(elementName);
	 var elemColl = new Array();
	 for (i = 0; i< allElements.length; i++) {
	     if (isClass(allElements[i], className)) {
	     				 elemColl[elemColl.length] = allElements[i];
					 			   }
								   }
								   return elemColl;
}

function isParentOrSelf(element, id) {
	 if (element == null || element.nodeName=='BODY') return false;
	 else if (element.id == id) return true;
	 else return isParentOrSelf(element.parentNode, id);
}

function nodeValue(node) {
	 var result = "";
	 if (node.nodeType == 1) {
	    var children = node.childNodes;
	    	for ( i = 0; i < children.length; ++i ) {
		      result += nodeValue(children[i]);
		      	     }		
			     }
			     else if (node.nodeType == 3) {
			     	  result = node.nodeValue;
				  }
				  return(result);
}

function slideLabel() {
	 var slideColl = GetElementsWithClassName('div','slide');
	 var list = document.getElementById('jumplist');
	 smax = slideColl.length;
	 for (n = 0; n < smax; n++) {
	     var obj = slideColl[n];

	     	 var did = 'slide' + n.toString();
		     obj.setAttribute('id',did);
			if(isOp) continue;

				 var otext = '';
 				     var menu = obj.firstChild;
				     	 if (!menu) continue; // to cope with empty slides
					    while (menu && menu.nodeType == 3) {
					    	  	menu = menu.nextSibling;
							     }
								if (!menu) continue; // to cope with slides with only text nodes

								   var menunodes = menu.childNodes;
								       for (o = 0; o < menunodes.length; o++) {
								       	      otext += nodeValue(menunodes[o]);
									      	    }
											list.options[list.length] = new Option(n+' : ' +otext,n);
											}
}

function currentSlide() {
	 var cs;
	 if (document.getElementById) {
	    cs = document.getElementById('currentSlide');
	    } else {
	      cs = document.currentSlide;
	      }
	      cs.innerHTML = '<span id="csHere">' + snum + '<\/span> ' + 
	      		   '<span id="csSep">\/<\/span> ' + 
			   	  '<span id="csTotal">' + (smax-1) + '<\/span>';
				  if (snum == 0) {
				     cs.style.visibility = 'hidden';
				     } else {
				       cs.style.visibility = 'visible';
				       }
}

function go(inc) {
	 if (document.getElementById("slideProj").disabled) return;
	 var cid = 'slide' + snum;
	 if (inc != 'j') {
	    snum += inc;
	    	 lmax = smax - 1;
		      if (snum > lmax) snum = 0;
		      	 if (snum < 0) snum = lmax;
			 } else {
			   snum = parseInt(document.getElementById('jumplist').value);
			   }
			   var nid = 'slide' + snum;
			   var ne = document.getElementById(nid);
			   if (!ne) {
			      ne = document.getElementById('slide0');
			      	 snum = 0;
				 }
				 document.getElementById(cid).style.visibility = 'hidden';
				 ne.style.visibility = 'visible';
				 document.getElementById('jumplist').selectedIndex = snum;
				 currentSlide();
}

function toggle() {
    var slideColl = GetElementsWithClassName('div','slide');
    var obj = document.getElementById('slideProj');
    if (!obj.disabled) {
        obj.disabled = true;
        for (n = 0; n < smax; n++) {
            var slide = slideColl[n];
            slide.style.visibility = 'visible';
        }
    } else {
        obj.disabled = false;
        for (n = 0; n < smax; n++) {
            var slide = slideColl[n];
            slide.style.visibility = 'hidden';
        }
        slideColl[snum].style.visibility = 'visible';
    }
}

function showHide(action) {
	 var obj = document.getElementById('jumplist');
	 switch (action) {
	 case 's': obj.style.visibility = 'visible'; break;
	 case 'h': obj.style.visibility = 'hidden'; break;
	 case 'k':
	      if (obj.style.visibility != 'visible') {
	      	 		       obj.style.visibility = 'visible';
				       			    } else {
							      	   obj.style.visibility = 'hidden';
								   			}
											break;
											}
}

// 'keys' code adapted from MozPoint (http://mozpoint.mozdev.org/)
function keys(key) {
	 if (!key) {
	    key = event;
	    	key.which = key.keyCode;
		}
 		switch (key.which) {
		       case 10: // return
		       	    case 13: // enter
			    	     if (window.event && isParentOrSelf(window.event.srcElement, "controls")) return;
				     		      if (key.target && isParentOrSelf(key.target, "controls")) return;
						      	 case 32: // spacebar
							      case 34: // page down
							      	   case 39: // rightkey
								   	case 40: // downkey
									     	 go(1);
												break;
													case 33: // page up
													     case 37: // leftkey
													     	  case 38: // upkey
														       	   go(-1);
															     break;
															      case 84: // t
															      	       toggle();
																         break;
																	  case 67: // c
																	       	   showHide('k');
																		     break;
																		     }
}

function clicker(e) {
	 var target;
	 if (window.event) {
	    target = window.event.srcElement;
	    	   e = window.event;
		   } else target = e.target;
 		   if (target.href != null || isParentOrSelf(target, 'controls')) return true;
		   if (!e.which || e.which == 1) go(1);
}

function slideJump() {
	 if (window.location.hash == null) return;
	 var sregex = /^#slide(\d+)$/;
	 var matches = sregex.exec(window.location.hash);
	 var dest = null;
	 if (matches != null) {
	    dest = parseInt(matches[1]);
	    } else {
	      var target = window.location.hash.slice(1);
	      	  var targetElement = null;
		      var aelements = document.getElementsByTagName("a");
		      	  for (i = 0; i < aelements.length; i++) {
			      	 var aelement = aelements[i];
				     	      if ( (aelement.name && aelement.name == target)
					      	    || (aelement.id && aelement.id == target) ) {
						       		       targetElement = aelement;
											break;
													}
														}
															while(targetElement != null && targetElement.nodeName != "body") {
																	       if (targetElement.className == "slide") break;
																	       	  			   targetElement = targetElement.parentNode;
																					   		 }
																							  if (targetElement != null && targetElement.className == "slide") {
																							     		    dest = parseInt(targetElement.id.slice(1));
																									    	 }
																										 }
																										 if (dest != null)
																										    go(dest - snum);
 }
 
function createControls() {
	 controlsDiv = document.getElementById("controls");
	 if (!controlsDiv) return;
	 controlsDiv.innerHTML = '<form action="#" id="controlForm">' +
	 '<div>' +
	 '<a accesskey="t" id="toggle" href="javascript:toggle();">&#216;<\/a>' +
	 '<a accesskey="z" id="prev" href="javascript:go(-1);">&laquo;<\/a>' +
	 '<a accesskey="x" id="next" href="javascript:go(1);">&raquo;<\/a>' +
	 '<\/div>' +
	 '<div onmouseover="showHide(\'s\');" onmouseout="showHide(\'h\');"><select id="jumplist" onchange="go(\'j\');"><\/select><\/div>' +
	 '<\/form>';
}

function notOperaFix() {
	 var obj = document.getElementById('slideProj');
	 obj.setAttribute('media','screen');
	 if (isGe) {
	    obj.setAttribute('href','null');   // Gecko fix
	    				       obj.setAttribute('href',slideCSS); // Gecko fix
					       }
}

function startup() {
	 if (!isOp) createControls();
	 slideLabel();
	 if (!isOp) {		
	    notOperaFix();
		slideJump();
			document.onkeyup = keys;
					 document.onclick = clicker;
					 }
}

window.onload = startup;