Emanue1

var a = new Image();
var b = new Image();
var loadedCounter = 0;
a.src = '//lorempixel.com/400/200/sports/'
b.src = '//lorempixel.com/400/200/cats/'
a.onload = b.onload = function() {
   loadedCounter++;
   if (loadedCounter == 2) {
     runFunction();
   }
}