function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      func();
      oldonload();
     }
  }
}

function getAllChildren(e) {
  // Returns all children of element. Workaround required for IE5/Windows. Ugh.
  return e.all ? e.all : e.getElementsByTagName('*');
}

function centerThumb(img, width, height){
	/*img.style.position="relative";
	moveleft = Math.round((width - img.width) / 2);
	if (moveleft>0)
		img.style.left= moveleft + "px";
	movetop = Math.round((height - img.height) / 2);
	if (movetop>0)
		img.style.top= movetop + "px";
*/
}

document.getElementsBySelector = function(selector) {
  // Attempt to fail gracefully in lesser browsers
  if (!document.getElementsByTagName) {
    return new Array();
  }
  // Split selector in to tokens
  var tokens = selector.split(' ');
  var currentContext = new Array(document);
  for (var i = 0; i < tokens.length; i++) {
    token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
    if (token.indexOf('#') > -1) {
      // Token is an ID selector
      var bits = token.split('#');
      var tagName = bits[0];
      var id = bits[1];
      var element = document.getElementById(id);
      if (tagName && element.nodeName.toLowerCase() != tagName) {
        // tag with that ID not found, return false
        return new Array();
      }
      // Set currentContext to contain just this element
      currentContext = new Array(element);
      continue; // Skip to next token
    }
    if (token.indexOf('.') > -1) {
      // Token contains a class selector
      var bits = token.split('.');
      var tagName = bits[0];
      var className = bits[1];
      if (!tagName) {
        tagName = '*';
      }
      // Get elements matching tag, filter them for class selector
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      continue; // Skip to next token
    }
    // Code to deal with attribute selectors
    if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
      var tagName = RegExp.$1;
      var attrName = RegExp.$2;
      var attrOperator = RegExp.$3;
      var attrValue = RegExp.$4;
      if (!tagName) {
        tagName = '*';
      }
      // Grab all of the tagName elements within current context
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      var checkFunction; // This function will be used to filter the elements
      switch (attrOperator) {
        case '=': // Equality
          checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
          break;
        case '~': // Match one of space seperated words 
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
          break;
        case '|': // Match start with value followed by optional hyphen
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
          break;
        case '^': // Match starts with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
          break;
        case '$': // Match ends with value - fails with "Warning" in Opera 7
          checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
          break;
        case '*': // Match ends with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
          break;
        default :
          // Just test for existence of attribute
          checkFunction = function(e) { return e.getAttribute(attrName); };
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (checkFunction(found[k])) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
      continue; // Skip to next token
    }
    // If we get here, token is JUST an element (not a class or ID selector)
    tagName = token;
    var found = new Array;
    var foundCount = 0;
    for (var h = 0; h < currentContext.length; h++) {
      var elements = currentContext[h].getElementsByTagName(tagName);
      for (var j = 0; j < elements.length; j++) {
        found[foundCount++] = elements[j];
      }
    }
    currentContext = found;
  }
  return currentContext;
}

function moveElement(elementID,final_x,final_y,interval) {
	if (!document.getElementById) return false;
	if (!document.getElementById(elementID)) return false;
	var elem = document.getElementById(elementID);

	if (elem.movement) {
		clearTimeout(elem.movement);
	}
	if (!elem.style.left) {
		elem.style.left = "0px";
	}
	if (!elem.style.top) {
		elem.style.top = "0px";
	}

	var xpos = parseInt(elem.style.left);
	var ypos = parseInt(elem.style.top);

	if (xpos == final_x && ypos == final_y) {
		return true;
	}
	if (xpos < final_x) {
		var dist = Math.ceil((final_x - xpos)/10);
		xpos = xpos + dist;
	}
	if (xpos > final_x) {
		var dist = Math.ceil((xpos - final_x)/10);
		xpos = xpos - dist;
	}
	if (ypos < final_y) {
		var dist = Math.ceil((final_y - ypos)/10);
		ypos = ypos + dist;
	}
	if (ypos > final_y) {
		var dist = Math.ceil((ypos - final_y)/10);
		ypos = ypos - dist;
	}
	elem.style.left = xpos + "px";
	elem.style.top = ypos + "px";
	var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
	elem.movement = setTimeout(repeat,interval);
}

//Larghezza dei box della timeline
var box = 138;

function goBack(){
	var boxes = document.getElementById("display").getElementsByTagName("div");
	browser = navigator.userAgent.toLowerCase();
	if (browser.indexOf("firefox")!=-1)
		display = document.getElementById("display");

	// need to prevent clicking while move is happening
	position = parseInt(display.style.left);

	back = position + box* 1;
	var remainder = position % box;
	//alert(back + " - " + remainder);
	if (back > 0 || remainder != 0){ return false; }

	moveElement("display",back,0,20);
	return false;
}

function goForward(minboxes){
	if (!minboxes)
		minboxes = 1;
	var boxes = document.getElementById("display").getElementsByTagName("div");
	var limit = ((boxes.length - (minboxes-1)) * box * - 1);
	browser = navigator.userAgent.toLowerCase();
	if (browser.indexOf("firefox")!=-1)
		display = document.getElementById("display");
	// need to prevent clicking while move is happening
	position = parseInt(display.style.left);
	if (isNaN(position))
		position=0;
	var forwards = position - box;
	var remainder = position % box;
	//alert("forwards="+forwards+" limit="+limit+" remainder="+remainder);
	if (forwards <= limit || remainder != 0){ return false; }
	
	moveElement("display",forwards,0,20);
	return false;
}

function prepareTimeline() {

	if (!document.getElementsByTagName) return false;
	if (!document.getElementById) return false;

	var timeline = document.getElementById("timeline");
	if (timeline){

			// fetch the custom width, cunningly hidden in the title of the heading.
			// ...then apply it to the 

			var timelinetitle = document.getElementById("t-line");

			if (timeline.title == ""){
				var boxwidth = 610; // default value
				//var boxheight = 175; // default value
				var boxheight = 150; // default value
			} else {
				var boxsize = timeline.title.split('-');
				var boxwidth = boxsize[0];
				var boxheight = boxsize[1];
			}

			timeline.title = ""; // remove the title once it s read to prevent mouseover thiingy

			//Imposto la larghezza della timeline
			timeline.style.width = boxwidth + "px";
			timeline.style.height = boxheight + "px";

			var boxes = document.getElementById("timeline").getElementsByTagName("div");
			var display = document.getElementById("display");

			//Correggo la larghezza della finestra sulla timeline in base al numero di elementi da mostrare
			display.style.width = (boxes.length * box) + "px";
	}
}

addLoadEvent(prepareTimeline);