function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}
addLoadEvent(show);
function show(){
var box=document.getElementById("placelist").getElementsByTagName("li");
for(var i=0;i<box.length;i++){
box[i].onmouseover=function(){
this.className="changecolor";
}
box[i].onmouseout=function(){
this.className="";
}
}
}