alert();
var buttons = '';

function init(){
alert();
	buttons = getElementsByClass('navBtn');
	for(i=0; i<buttons.length){
		buttons[i].onmouseover = flip;
	}
}

function flip(){
	if(this.style.className == 'navBtn'){
		this.style.className = 'navUp';
	}else{
		this.style.className = 'navBtn';
	}
}

function getElementsByClass(searchClass,node,tag) {
  var classElements = new Array();
  if (node == null)
    node = document;
  if (tag == null)
    tag = '*';
  var els = node.getElementsByTagName(tag);
  var elsLen = els.length;
  var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
  for (i = 0, j = 0; i < elsLen; i++) {
    if (pattern.test(els[i].className) ) {
      classElements[j] = els[i];
      j++;
    }
  }
  return classElements;
}