// Copyright © 1992-2007 华南师范大学《师大青年》版权所有
var Menus=[];
Menus[0]=[];
Menus[1]=[];
Menus[2]=[];
Menus[3]=[];
Menus[4]=[];
for(var i=0;i<5;i++){
  Menus[i][0]=null;
  Menus[i][1]=0;
  Menus[i][2]=0;
  Menus[i][3]=null;
}
var MaxOpacity=0.85,OpacityStep=0.15,OpacityStepTime=60;
function DisplayMenu(_){
  if(Menus[_][0]==null){
    Menus[_][0]=$("submenu"+_);
  }
  if(Menus[_][3]!=null){
    clearTimeout(Menus[_][3]);
    Menus[_][3]=null;
    return ;
  }
  if(Menus[_][2]==0){
    Menus[_][2]=1;
    GrowToDisplay(_);
  }else {
    setTimeout("DisplayMenu("+_+")",OpacityStepTime*6);
  }
}
function GrowToDisplay($){
  if(Menus[$][2]!=1){
    return ;
  }
  if(Menus[$][1]==0){
    Menus[$][0].style.display="block";
  }
  Menus[$][1]+=OpacityStep;
  if(Menus[$][1]>MaxOpacity){
    Menus[$][1]=MaxOpacity;
  }
  if(typeof (Menus[$][0].style.filter)=="undefined"){
    Menus[$][0].style.opacity=Menus[$][1];
  }else {
    if(typeof (Menus[$][0].style.opacity)=="undefined"){
      Menus[$][0].filters.Alpha.opacity=parseInt(Menus[$][1]*100);
    }
  }
  if(Menus[$][1]<MaxOpacity){
    setTimeout("GrowToDisplay("+$+");",OpacityStepTime);
  }else {
    Menus[$][2]=0;
  }
}
function HideMenu(_){
  if(Menus[_][0]==null){
    Menus[_][0]=$("submenu"+_);
  }
  Menus[_][3]=setTimeout("GrowToHidden("+_+")",OpacityStepTime*1.5);
}
function GrowToHidden($){
  Menus[$][3]=null;
  Menus[$][2]=-1;
  Menus[$][1]-=OpacityStep;
  if(Menus[$][1]<0){
    Menus[$][1]=0;
  }
  if(typeof (Menus[$][0].style.filter)=="undefined"){
    Menus[$][0].style.opacity=Menus[$][1];
  }else {
    if(typeof (Menus[$][0].style.opacity)=="undefined"){
      Menus[$][0].filters.Alpha.opacity=parseInt(Menus[$][1]*100);
    }
  }
  if(Menus[$][1]>0){
    setTimeout("GrowToHidden("+$+");",OpacityStepTime);
  }else {
    Menus[$][0].style.display="none";
    Menus[$][2]=0;
  }
}