Fadomatic.INTERVAL_MILLIS=10;
function Fadomatic (element, rate, initialOpacity, minOpacity, maxOpacity){
this._element=element;
this._intervalId=null;
this._rate=rate;
this._isFadeOut=true;
this._minOpacity=0;
this._maxOpacity=99;
this._opacity=99;
if (typeof minOpacity !='undefined'){
if (minOpacity<0){
this._minOpacity=0;
}else if (minOpacity>99){
this._minOpacity=99;
}else{
this._minOpacity=minOpacity;
}
}
if (typeof maxOpacity !='undefined'){
if (maxOpacity<0){
this._maxOpacity=0;
}else if (maxOpacity>99){
this._maxOpacity=99;
}else{
this._maxOpacity=maxOpacity;
}
if (this._maxOpacity<this._minOpacity){
this._maxOpacity=this._minOpacity;
}
}
if (typeof initialOpacity !='undefined'){
if (initialOpacity>this._maxOpacity){
this._opacity=this._maxOpacity;
}else if (initialOpacity<this._minOpacity){
this._opacity=this._minOpacity;
}else{
this._opacity=initialOpacity;
}
}
if(typeof element.style.opacity !='undefined'){
this._updateOpacity=this._updateOpacityW3c;
}else if(typeof element.style.filter !='undefined'){
if (element.style.filter.indexOf("alpha")==-1){
var existingFilters="";
if (element.style.filter){
existingFilters=element.style.filter+" ";
}
element.style.filter=existingFilters+"alpha(opacity="+this._opacity+")";
}
this._updateOpacity=this._updateOpacityMSIE;
}else{
this._updateOpacity=this._updateVisibility;
}
this._updateOpacity();
}
Fadomatic.prototype.fadeOut=function (){
this._isFadeOut=true;
this._beginFade();
}
Fadomatic.prototype.fadeIn=function (){
this._isFadeOut=false;
this._beginFade();
}
Fadomatic.prototype.show=function (){
this.haltFade();
this._opacity=this._maxOpacity;
this._updateOpacity();
}
Fadomatic.prototype.hide=function (){
this.haltFade();
this._opacity=0;
this._updateOpacity();
}
Fadomatic.prototype.haltFade=function (){
clearInterval(this._intervalId);
}
Fadomatic.prototype.resumeFade=function (){
this._beginFade();
}
Fadomatic.prototype._beginFade=function (){
this.haltFade();
var objref=this;
this._intervalId=setInterval(function(){objref._tickFade();},Fadomatic.INTERVAL_MILLIS);
}
Fadomatic.prototype._tickFade=function (){
if (this._isFadeOut){
this._opacity -=this._rate;
if (this._opacity<this._minOpacity){
this._opacity=this._minOpacity;
this.haltFade();
}
}else{
this._opacity+=this._rate;
if (this._opacity>this._maxOpacity ){
this._opacity=this._maxOpacity;
this.haltFade();
}
}
this._updateOpacity();
}
Fadomatic.prototype._updateVisibility=function (){
if (this._opacity>0){
this._element.style.visibility='visible';
}else{
this._element.style.visibility='hidden';
}
}
Fadomatic.prototype._updateOpacityW3c=function (){
this._element.style.opacity=this._opacity/100;
this._updateVisibility();
}
Fadomatic.prototype._updateOpacityMSIE=function (){
this._element.filters.alpha.opacity=this._opacity;
this._updateVisibility();
}
Fadomatic.prototype._updateOpacity=null;