function pc3AccordionInitialize( brickId, action, fixHeight, animationDuration, tangens ){
	//set defaults for accordion
	accordion = document.getElementById(brickId);
	accordion.boxes = new Array();
	accordion.steps = 1;
	accordion.tangens = tangens;
	accordion.degrees = (Math.atan(accordion.tangens) * 360) / (Math.PI * 2);
	accordion.activeBox = null;
	accordion.fixedHeight = false;
	if ( action == "onmouseover" || ( action == "onclick" && fixHeight == 1 ) ) accordion.fixedHeight = true;

	//gather all boxes
	firstToOpen = null;
	maxTitleHeight = 0;
	maxContentHeight = 0;
	accordion.numberOfBoxes = 0;
	for( i = 0; i < accordion.childNodes.length; i++ ){
		box = accordion.childNodes[i];
		if ( box.nodeType == 1 ){
			box.accordion = accordion;
			box.position = accordion.numberOfBoxes;
			accordion.numberOfBoxes++;
			box.boxTitle = box.childNodes[0];
			box.boxTitle[action] = pc3AccordionBoxToggle;
			box.boxTitle.box = box;
			if ( !firstToOpen ) firstToOpen = box.boxTitle;
			box.boxTitle.style.cursor = "pointer";
			box.titleHeight = parseInt(box.boxTitle.scrollHeight);
			if ( box.titleHeight > maxTitleHeight ) maxTitleHeight = box.titleHeight;
		
			box.boxContent = box.childNodes[1];
			box.contentHeight = parseInt(box.boxContent.scrollHeight);
			if ( box.contentHeight > maxContentHeight ) maxContentHeight = box.contentHeight;
			accordion.boxes[box.position] = box;
		}
	}

	//set defaults for boxes
	for( i = 0; i < accordion.numberOfBoxes; i++ ){
		box = accordion.boxes[i];
		if ( accordion.fixedHeight ){
			box.titleHeight = maxTitleHeight;
			box.contentHeight = maxContentHeight;
		}
		box.direction = "";
		box.style.overflow = "hidden";
		box.currentHeight = 0;
		box.displayedHeight = 0;
		box.boxTitle.style.height = box.titleHeight +"px";
		box.boxContent.style.height = box.contentHeight +"px";
		box.style.height = box.titleHeight +"px";
	}
	
	firstToOpen[action]();
	accordion.steps = (animationDuration * 25) / 1000;
}

function pc3AccordionBoxToggle(){
	box = this.box;
	if ( box.accordion.activeBox != box ){
		box.accordion.activeBox = box;
		box.activeBoxes = new Array();
		boxCounter = 0;
		for(var i = 0; i < box.accordion.numberOfBoxes; i++){
			currentBox = box.accordion.boxes[i];
			if ( box.position == currentBox.position ){
				if ( currentBox.direction == 'close' && currentBox.displayedHeight > 0 ) pc3SetAccordionBoxReverse(currentBox);
				if ( currentBox.displayedHeight < currentBox.contentHeight ) currentBox.direction = 'open';
				else currentBox.direction = '';
			} else {
				if ( currentBox.direction == 'open' && currentBox.displayedHeight < currentBox.contentHeight ) pc3SetAccordionBoxReverse(currentBox);
				if ( currentBox.displayedHeight > 0 ) currentBox.direction = 'close';
				else currentBox.direction = '';
				if ( currentBox.direction ){
					box.activeBoxes[boxCounter] = currentBox.position;
					boxCounter++;
				}
			}
		}
		if ( box.accordion.fixedHeight ) pc3AccordionBoxSlideFixed( box );
		else pc3AccordionBoxSlide( box );
	}
}

function pc3AccordionBoxSlideFixed( box ){
	if ( box == box.accordion.activeBox ){
		step = box.contentHeight / box.accordion.steps;
		if ( step < 0.5 ) step = 0.51;
		box.currentHeight = Math.round(box.currentHeight + step);
		displayedHeight = pc3AccordionBoxGetDisplayHeight(box, box.direction);
		totalMove = displayedHeight - box.displayedHeight;
		if ( displayedHeight >= box.contentHeight || totalMove <= 0 ){
			box.currentHeight = box.contentHeight;
			box.displayedHeight = box.currentHeight;
			totalMove = 10000;
			box.direction = '';
		} else {
			box.displayedHeight = displayedHeight;
		}
		box.style.height = (box.titleHeight + box.displayedHeight)+"px";
		totalMoveHeight = 0;
		remainingTotalMove = totalMove;

		
		numberOfActiveBoxes = box.activeBoxes.length;
		for(var i = 0; i < numberOfActiveBoxes; i++) totalMoveHeight = totalMoveHeight + box.accordion.boxes[box.activeBoxes[i]].displayedHeight;
		
		removeBoxes = new Array();
		removeBoxesCounter = 0;
		for(var i = 0; i < numberOfActiveBoxes; i++){
			if ( box == box.accordion.activeBox ){
				currentBox = box.accordion.boxes[box.activeBoxes[i]];
				if ( i == (numberOfActiveBoxes - 1) ){
					currentBox.displayedHeight = currentBox.displayedHeight - remainingTotalMove;
				} else {
					move = Math.round((totalMove * currentBox.displayedHeight) / totalMoveHeight);
					if ( move > remainingTotalMove ) move = remainingTotalMove;
					remainingTotalMove = remainingTotalMove - move;
					currentBox.displayedHeight = currentBox.displayedHeight - move;
				}
				if ( currentBox.displayedHeight <= 0 ){
					currentBox.displayedHeight = 0;
					currentBox.currentHeight = 0;
					currentBox.direction = '';
					removeBoxes[removeBoxesCounter] = i;
					removeBoxesCounter++;
				} else {
					currentBox.currentHeight = pc3AccordionBoxGetCurrentHeight(currentBox);
				}
				currentBox.style.height = (currentBox.titleHeight + currentBox.displayedHeight)+"px";
			}
		}
		for(var i = 0; i < removeBoxes.length; i++) box.activeBoxes.splice((removeBoxes[i]-i),1);
		if ( box.activeBoxes.length > 0 || box.contentHeight != box.displayedHeight ) setTimeout(function() { pc3AccordionBoxSlideFixed(box); },40);
	}
}


function pc3AccordionBoxSlide( box ){
	if ( box == box.accordion.activeBox ){
		allBoxesMoved = true;
		for(var i = 0; i < box.accordion.numberOfBoxes; i++){
			currentBox = box.accordion.boxes[i];
			if ( currentBox.direction ){
				step = currentBox.contentHeight / box.accordion.steps;
				if ( step < 0.5 ) step = 0.51;

				if ( box.position == currentBox.position ){
					currentBox.currentHeight = Math.round(currentBox.currentHeight + step);
					if ( currentBox.currentHeight >= currentBox.contentHeight ){
						currentBox.currentHeight = currentBox.contentHeight;
						currentBox.displayedHeight = currentBox.currentHeight;
						currentBox.direction = '';
					} else {
						currentBox.displayedHeight = pc3AccordionBoxGetDisplayHeight(currentBox, currentBox.direction);
						allBoxesMoved = false;
					}
				} else {
					currentBox.currentHeight = Math.round(currentBox.currentHeight - step);
					if ( currentBox.currentHeight <= 0 ){
						currentBox.currentHeight = 0;
						currentBox.displayedHeight = currentBox.currentHeight;
						currentBox.direction = '';
					} else {
						currentBox.displayedHeight = pc3AccordionBoxGetDisplayHeight(currentBox, currentBox.direction);
						allBoxesMoved = false;
					}
				}
				currentBox.style.height = (currentBox.titleHeight + currentBox.displayedHeight)+"px";
			}
		}
		
		if ( !allBoxesMoved ) setTimeout(function() { pc3AccordionBoxSlide(box); },40);
	}
}


function pc3AccordionBoxGetDisplayHeight( box, direction ){
	if ( direction == "open" ) return box.contentHeight - Math.round(box.contentHeight * pc3AccordionBoxGetFactor( box, box.direction ));
	else return Math.round(box.contentHeight * pc3AccordionBoxGetFactor( box, box.direction ));
}


function pc3AccordionBoxGetFactor( box, direction ){
	if ( direction == "open" ) pastDegrees = box.accordion.degrees - ((box.currentHeight * box.accordion.degrees) / box.contentHeight);
	else pastDegrees = (box.currentHeight * box.accordion.degrees) / box.contentHeight;
	if ( pastDegrees > box.accordion.degrees ) pastDegrees = box.accordion.degrees;
	if ( pastDegrees < 0 ) pastDegrees = 0;
	return Math.tan((pastDegrees * (Math.PI * 2)) / 360) / box.accordion.tangens;
}

function pc3SetAccordionBoxReverse( box ){
	degrees = (Math.atan(box.accordion.tangens - (pc3AccordionBoxGetFactor( box, box.direction ) * box.accordion.tangens)) * 360) / (Math.PI * 2);
	if ( box.direction == "open" ) box.currentHeight = Math.round((box.contentHeight * degrees) / box.accordion.degrees);
	else box.currentHeight = box.contentHeight - Math.round((box.contentHeight * degrees) / box.accordion.degrees);
}


function pc3AccordionBoxGetCurrentHeight( box ){
	degrees = (box.displayedHeight * box.accordion.degrees) / box.contentHeight;
	tangens = (degrees * box.accordion.tangens) / box.accordion.degrees;
	return Math.round((((Math.atan(tangens) * 360) / (Math.PI * 2)) * box.contentHeight) / box.accordion.degrees);
}