var acc_svgdata = ["data:image/svg+xml,"+
"%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E"+
"%3Cpath style='fill:black;opacity:0' d='M16,16H0V0h16v16z'/%3E"+
"%3Cpath style='fill:rgb(240,240,240)' d='M14,14H2V2h12v12z'/%3E"+
"%3Cpath style='fill:rgb(64,64,64)' d='M13,13H3V3h10v10z'/%3E"+
"%3Cpath style='fill:rgb(248,248,248)' d='M12,12H4V4h8v8z'/%3E"+
"%3Cpath style='fill:rgb(80,128,208)' d='", "'/%3E%3C/svg%3E",
"M5,7h2v-2h2v2h2v2h-2v2h-2v-2h-2z", "M11,9H5V7h6v6z"];
var a = document.getElementsByClassName("accordion");
for(var i=0; i<a.length; i++){
var img = document.createElement("img");
img.src = acc_svgdata[0]+acc_svgdata[2]+acc_svgdata[1];
img.className = "accordion_btn accordion_btn_plus";
a[i].insertBefore(img,a[i].firstChild);
img = document.createElement("img");
img.src = acc_svgdata[0]+acc_svgdata[3]+acc_svgdata[1];
img.className = "accordion_btn accordion_btn_minus";
a[i].insertBefore(img,a[i].firstChild);
a[i].addEventListener("click",function(){
var x = this.nextElementSibling;
if( this.classList.contains("accordion_closed") ){
x.style.maxHeight = x.scrollHeight + "px";
setTimeout(function(){
x.style.maxHeight = "";
},250);
}else{
x.style.maxHeight = x.scrollHeight + "px";
setTimeout(function(){
x.style.maxHeight = "0";
},1);
}
this.classList.toggle("accordion_closed");
});
}