function Effect_Shade(){if(this.animSteps.length){var step=this.animSteps.shift();this.elem.style.height=step+'px';var o=this;this.shadeId=window.setTimeout(function(){o.shade()},this.STEP_DELAY);}else{this.shadeId=null;if(this.postHook){this.postHook();this.postHook=null;}}}
function Effect_ShadeSetup(dir){var o;if(this.shadeId||this.elem.style.visibility=='hidden'){return;}
if(dir=='up'||!this.openHeight){this.openHeight=Effect.findElementHeight(this.elem);}
if(!this.openHeight){return;}
var m,h;if(dir=='up'){m=-1;h=this.openHeight
o=this;this.postHook=function(){o.elem.style.visibility='hidden'};}else{m=1;h=0;this.postHook=null;}
var steps=Math.floor(this.openHeight/this.STEP_PIX);var dy=Math.floor(this.openHeight/steps)*m;while(steps--){this.animSteps.push(h);h+=dy;}
this.animSteps.push(dir=='up'?0:this.openHeight);this.elem.style.overflow='hidden';o=this;this.shadeDownId=window.setTimeout(function(){o.shade(dir)},this.STEP_DELAY);}
function Effect_ShadeUp(){this._shadeSetup('up');}
function Effect_ShadeDown(){this.elem.style.visibility='visible';this._shadeSetup('down');}
function Effect(elem){this.elem=elem;this.STEP_PIX=10;this.STEP_DELAY=10;this.animSteps=new Array();this.openHeight=Effect.findElementHeight(this.elem);}
Effect.prototype.shade=Effect_Shade;Effect.prototype.shadeUp=Effect_ShadeUp;Effect.prototype.shadeDown=Effect_ShadeDown;Effect.prototype._shadeSetup=Effect_ShadeSetup;Effect.findElementHeight=function(elem){if(elem&&elem.style.height&&elem.style.height!='auto'){return parseInt(elem.style.height);}else if(elem&&typeof elem.offsetHeight!='undefined'){return elem.offsetHeight;}
return null;}