/* 

Example Javascript Animation Techniques by Hesido.com;
4 different, reusable examples

*/
if (document.getElementById && document.getElementsByTagName) {
if (window.addEventListener) window.addEventListener('load', initAnims, false);
else if (window.attachEvent) window.attachEvent('onload', initAnims);
}

function initAnims() {

	//	Init fade animation without memory, single direction
		/*var animElements = document.getElementById("fadercontainer").getElementsByTagName("p");
		for(var i=0; i<animElements.length; i++) {
			animElements[i].onmouseover = fadeBGCol;
			}
			
		function fadeBGCol() {
			doBGFade(this,[186,161,94],[65,65,65],'rgb(65,65,65)',20,20,1);
			}
		*/	
			var animElements = document.getElementById("fadercontainer").getElementsByTagName("p");
		for(var i=0; i<animElements.length; i++) {
			animElements[i].onmouseover = fadeBGColMem;
			animElements[i].onmouseout = fadeBGColRestore;
			}

		function fadeBGColMem() {
			if (!this.currentbgRGB) this.currentbgRGB = [65,65,65]; //if no mem is set, set it first;
			doBGFadeMem(this,this.currentbgRGB,[186,161,94],6,20,1);
			}

		function fadeBGColRestore() {
			if (!this.currentbgRGB) return;	//avoid error if mouseout an element occurs before the mosueover
												//(e.g. the pointer already in the object when onload)
			doBGFadeMem(this,this.currentbgRGB,[65,65,65],28,20,1);
			}
					
	}

//*******************

function doBGFade(elem,startRGB,endRGB,finalColor,steps,intervals,powr) {
//BG Fader by www.hesido.com
	if (elem.bgFadeInt) window.clearInterval(elem.bgFadeInt);
	var actStep = 0;
	elem.bgFadeInt = window.setInterval(
		function() {
			elem.style.backgroundColor = "rgb("+
				easeInOut(startRGB[0],endRGB[0],steps,actStep,powr)+","+
				easeInOut(startRGB[1],endRGB[1],steps,actStep,powr)+","+
				easeInOut(startRGB[2],endRGB[2],steps,actStep,powr)+")";
			actStep++;
			if (actStep > steps) {
			elem.style.backgroundColor = finalColor;
			window.clearInterval(elem.bgFadeInt);
			}
		}
		,intervals)
}

//*******************
function doBGFadeMem(elem,startRGB,endRGB,steps,intervals,powr) {
//BG Fader with Memory by www.hesido.com
	if (elem.bgFadeMemInt) window.clearInterval(elem.bgFadeMemInt);
	var actStep = 0;
	elem.bgFadeMemInt = window.setInterval(
		function() {
			elem.currentbgRGB = [
				easeInOut(startRGB[0],endRGB[0],steps,actStep,powr),
				easeInOut(startRGB[1],endRGB[1],steps,actStep,powr),
				easeInOut(startRGB[2],endRGB[2],steps,actStep,powr)
				];
			elem.style.backgroundColor = "rgb("+
				elem.currentbgRGB[0]+","+
				elem.currentbgRGB[1]+","+
				elem.currentbgRGB[2]+")";
			actStep++;
			if (actStep > steps) window.clearInterval(elem.bgFadeMemInt);
		}
		,intervals)
}
//********************
function easeInOut(minValue,maxValue,totalSteps,actualStep,powr) {
//Generic Animation Step Value Generator By www.hesido.com
	var delta = maxValue - minValue;
	var stepp = minValue+(Math.pow(((1 / totalSteps)*actualStep),powr)*delta);
	return Math.ceil(stepp)
}