Per Javascript einem div element eine neue klasse zuweisen

[b4RnY]

Ich hab das ganze noch mal in der Form gemacht:

function xxxxx() {
  var xxxx = document.getElementById("xxxx1");
  if (xxxx.style.width == "600px") {
      xxxx.style.width = "100%";
  }
  else {
      xxxx.style.width = "600px";
  }

if (xxxx.style.height == "400px") {
      xxxx.style.height = "100%";
  }
  else {
      xxxx.style.height = "400px";
  }

if (xxxx.style.top == "50%") {
      xxxx.style.top = "0";
  }
  else {
      xxxx.style.top = "50%";
  }

if (xxxx.style.left == "50%") {
      xxxx.style.left = "0";
  }
  else {
      xxxx.style.left = "50%";
  }

if (xxxx.style.margin-left = "-300px") {
      xxxx.style.margin-left = "0";
  }
  else {
      xxxx.style.margin-left = "-300px";";
  }

if (xxxx.style.margin-top = "-200px") {
      xxxx.style.margin-top = "0";
  }
  else {
      xxxx.style.margin-top = "-200px";";
  }
}

Und ab margin-left gibts probleme, also alles funktioniert bis auf margin-left und margin-top