function qieHuanStart(){
 var _1=document.getElementById("h_qiehuan").getElementsByTagName("li");
for(var i=0;i<_1.length;i++){
_1[i].onmouseover=function(){
this.className+=(this.className.length>0?" ":"")+"cityhover";
};
_1[i].onmouseout=function(){
this.className=this.className.replace(new RegExp("( ?|^)cityhover\\b"),"");
};
}
}; 
function $(o){
 var o=document.getElementById(o)?document.getElementById(o):'';
 return o;
}