/**通过ID获取Element对象*/
function $(id)
{
 return document.getElementById(id);
}

/**
 * 加入事件到装载列表
 */
function addLoadEvent(func)
{

 var oldonload = window.onload;
 if (typeof window.onload != 'function')
 {
  window.onload = func;
 }
 else
 {
  window.onload = function()
  {
   oldonload();
   func();
  }
 }
}

var slideMenu=function(){
 var sp,st,t,m,sa,l,w,sw,ot;
 return{
  build:function(sm,sw,mt,s,sl,h){
   sp=s; st=sw; t=mt;
   m=document.getElementById(sm);
   sa=m.getElementsByTagName('li');
   l=sa.length; w=m.offsetWidth - 10; sw=w/l;
   ot=Math.floor((w-st)/(l-1)); var i=0;
   for(i;i<l;i++){s=sa[i]; s.style.width=sw+'px'; this.timer(s)}
   if(sl!=null){m.timer=setInterval(function(){slideMenu.slide(sa[sl-1])},t)}
  },
  timer:function(s){s.onmouseover=function(){clearInterval(m.timer);m.timer=setInterval(function(){slideMenu.slide(s)},t)}},
  slide:function(s){
   var cw=parseInt(s.style.width,'10');
   if(cw<st){
    var owt=0; var i=0;
    for(i;i<l;i++){
     if(sa[i]!=s){
      var o,ow; var oi=0; o=sa[i]; ow=parseInt(o.style.width,'10');
      if(ow>ot){oi=Math.floor((ow-ot)/sp); oi=(oi>0)?oi:1; o.style.width=(ow-oi)+'px'}
      owt=owt+(ow-oi)}}
    s.style.width=(w-owt)+'px';
   }else{clearInterval(m.timer)}
  }
 };
}();

//addLoadEvent(initScrollPic);