diff --git a/common/HTMLElement.js b/common/HTMLElement.js
new file mode 100644
index 0000000..8b473ac
--- /dev/null
+++ b/common/HTMLElement.js
@@ -0,0 +1,32 @@
+HTMLElement.prototype.removeClass || (HTMLElement.prototype.removeClass = function(remove) {
+    var newClassName = "";
+    var i;
+    var classes = this.className.split(" ");
+    for(i = 0; i < classes.length; i++) {
+        if(classes[i] !== remove) {
+            newClassName += classes[i] + " ";
+        }
+    }
+    this.className = newClassName;
+});
+
+HTMLElement.prototype.hasClass || (HTMLElement.prototype.hasClass = function(cls) {
+    return (' ' + this.className + ' ').indexOf(' ' + cls + ' ') > -1;
+});
+
+HTMLElement.prototype.addClass || (HTMLElement.prototype.addClass = function(add) {
+    if(this.hasClass(add)) return;
+    this.className += ' ' + add;
+});
+
+HTMLElement.prototype.toggleClass || (HTMLElement.prototype.toggleClass = function(clazz) {
+	if(this.hasClass(clazz)) {
+		this.removeClass(clazz);
+	} else {
+		this.addClass(clazz);
+	}
+});
+
+HTMLElement.prototype.remove || (HTMLElement.prototype.remove = function() {
+    this.parentElement.removeChild(this);
+});