jquery_test.js

var elementsArrays = document.getElementsByTagName("h2");
var elements = elementsArrays[0];
$("#title2-button").click(function() {
    if(elements.style.color != "yellow"){
        $("#title2").css("color", "yellow");
    } else{
        $("#title2").css("color", "black");
    }
});

$("title3-button").click(function(){
  $("#space-sloth").animate({
    down: '600px',
    opacity: '0.5',
    height: '150px',
    width: '150px'
  });
});