//ff支持
function isie(){ //ie? 
   if (window.navigator.useragent.tolowercase().indexof("msie")>=1) 
    return true; 
   else 
    return false; 
} 

//首页幻灯
var lantern={

    onchange:[],
    ointerval:[],
    otimeout:[],
    opacitynum:101,
    cycnum:0,
    shownum:0,
    width:980,//整体宽度
    navyctr:[],//2维:  0.原长 1.目标长 2.speed 
    navytime:10,//navy动画时间
    picmovespeed:62,//图片移动速度
    timeout_time:7000,//停滞时间
    info ://0.图片url 1.名称 2.链接地址 
    [],
    
    init: function(){
        lantern.onchange=false;
        for(var i=0;i<lantern.info.length;i++)
        {
            var picdiv
            var pictemp
            picdiv=document.createelement('div');
            pictemp=document.createelement('img');
	        picdiv.id ="lanternimg"+i;
            picdiv.name=i;
	        pictemp.src = lantern.info[i][0];
	        pictemp.style.width = "980px";
	        pictemp.style.height = "224px";
	        picdiv.style.position ="absolute";
	        picdiv.style.left =lantern.width+"px";
	        picdiv.onclick=function(){window.open(lantern.info[this.name][2]);};
	        picdiv.appendchild(pictemp);
	        document.getelementbyid("lanternimg").appendchild(picdiv);
	        var divtemp
	        divtemp=document.createelement('div');
	        divtemp.id ="lanternn"+i;
            divtemp.name=i;
	        divtemp.innerhtml="<strong>"+(i+1)+"</strong><span id=\"lanternnc"+i+"\" style=\"display:none\">&nbsp;"+lantern.info[i][1]+"</span>";
	        if(i==0)
            {
               divtemp.classname ="div_off1";
            }
            else if(i==lantern.info.length-1)
            {
                divtemp.classname ="div_off3";
            }
            else
            {
                divtemp.classname ="div_off2";
            }
	        //divtemp.classname="div_off";
	        if(i==0)
	            divtemp.onclick=function(){window.open(lantern.info[this.name][2]);};
	        else
	            divtemp.onclick=function(){if(!lantern.onchange){lantern.onchange=true;lantern.setnavy(this.name);}};
	        document.getelementbyid("lanternnavy").appendchild(divtemp);
        }
        
        lantern.initnany();
    },
    
    initnany:function(){
        navyctr=new array();
        for(var k=0;k<lantern.info.length;k++)
            lantern.navyctr[k]=[];
        document.getelementbyid("lanternnc0").style.display ="";
        document.getelementbyid("lanternn0").classname ="div_on1";
        var onlength,offlength
        onlength=document.getelementbyid("lanternn0").offsetwidth
        offlength=(lantern.width-onlength)/(lantern.info.length-1)
        var numtemp=0;
        for(var j=0;j<lantern.info.length;j++)
        {
              if(j!=0)//未选
              {
                     lantern.navyctr[j][1]=offlength;
                     document.getelementbyid("lanternnc"+j).style.display ="none";
                    if(j==lantern.info.length-1)
                    {
                        document.getelementbyid("lanternn"+j).classname ="div_off3";
                    }
                    else
                    {
                        document.getelementbyid("lanternn"+j).classname ="div_off2";
                    }
                     document.getelementbyid("lanternn"+j).style.width=offlength+"px";
                     if(j==lantern.info.length-1) 
                     {
                        document.getelementbyid("lanternn"+j).style.width=(lantern.width-onlength-numtemp)+"px";  
                     }
                     else
                     {
                        numtemp+=offlength;
                     }
              }
              else//已选
              {
                 lantern.navyctr[j][1]=onlength;
              }
        }
        if(isie())
        document.getelementbyid("lanternpoint").style.left=(document.getelementbyid("lanternn0").offsetleft+10)+"px";
        else
        document.getelementbyid("lanternpoint").style.left=(document.getelementbyid("lanternn0").offsetleft-document.getelementbyid("lantern").offsetleft+10)+"px";
        document.getelementbyid("lanternimg0").style.display ="";
        document.getelementbyid("lanternimg0").style.left ="0px";
        lantern.otimeout=settimeout("lantern.cyclantern()",lantern.timeout_time);
    },
    
    setnavy:function(i){
        if(i==lantern.info.length-1)
             document.getelementbyid("lanternnavy").style.backgroundcolor ="#f90";
        else
             document.getelementbyid("lanternnavy").style.backgroundcolor ="#dcf2fb";
        document.getelementbyid("lanternnc"+i).style.display ="";
        if(i==0)
        {
            document.getelementbyid("lanternn"+i).classname ="div_on1";
        }
        else if(i==lantern.info.length-1)
        {
            document.getelementbyid("lanternn"+i).classname ="div_on3";
        }
        else
        {
            document.getelementbyid("lanternn"+i).classname ="div_on2";
        }
        document.getelementbyid("lanternn"+i).style.width=null;
        var onlength,offlength
        onlength=document.getelementbyid("lanternn"+i).offsetwidth
        offlength=(lantern.width-onlength)/(lantern.info.length-1)
        var numtemp=0;
        for(var j=0;j<lantern.info.length;j++)
        {
              lantern.navyctr[j][0]=lantern.navyctr[j][1];
              if(i!=j)//未选
              {
                     lantern.navyctr[j][1]=offlength;
                     document.getelementbyid("lanternnc"+j).style.display ="none";
                       if(j==lantern.info.length-1)
                        {
                            document.getelementbyid("lanternn"+j).classname ="div_off3";
                        }
                        else
                        {
                            document.getelementbyid("lanternn"+j).classname ="div_off2";
                        }
                     if(j==lantern.info.length-1) 
                     {
                        document.getelementbyid("lanternn"+j).style.width=(lantern.width-onlength-numtemp)+"px";
                     }
                     else
                     {
                        numtemp+=offlength
                     }
                     document.getelementbyid("lanternn"+j).style.width=lantern.navyctr[j][0]+"px";
              lantern.navyctr[j][2]=(lantern.navyctr[j][1]-lantern.navyctr[j][0])/lantern.navytime ;
              }
              else//已选
              {
                 lantern.navyctr[j][1]=onlength-34;
                 document.getelementbyid("lanternn"+j).style.width=lantern.navyctr[j][0]-34<=0?"0px":(lantern.navyctr[j][0]-34)+"px";                
                 lantern.navyctr[j][2]=(lantern.navyctr[j][1]-lantern.navyctr[j][0])/lantern.navytime ;
             
              }
        }
        document.getelementbyid("lanternimg"+i).style.display ="";
        if(lantern.onchange)
        {
                document.getelementbyid("lanternn"+i).onclick=function(){window.open(lantern.info[this.name][2]);};
                document.getelementbyid("lanternn"+lantern.shownum).onclick=function(){if(!lantern.onchange){lantern.onchange=true;lantern.setnavy(this.name);}};
                document.getelementbyid("lanternimg"+i).style.zindex=0;
                document.getelementbyid("lanternimg"+lantern.shownum).style.zindex=-1;
                lantern.ointerval=setinterval('lantern.changelantern('+i+')',10);
        }
    },
    
    imgmoveover:false,
    navymoveover:false,
     changelantern:function(i){
            if(lantern.otimeout!=null)
                cleartimeout(lantern.otimeout)
             //move
             if(!lantern.navymoveover)
                lantern.movenavy(i);
             if(!lantern.imgmoveover)
             {
                lantern.moveimg(i);
             }
             else
             {
                lantern.flashimg(i);
             }
    },
    
     movenavy:function(select){
            var breaktime=0;
            for(var i=0;i<lantern.info.length;i++)
            {
                  if((lantern.navyctr[i][2]>0&&document.getelementbyid("lanternn"+i).offsetwidth<lantern.navyctr[i][1])||(lantern.navyctr[i][2]<0&&document.getelementbyid("lanternn"+i).offsetwidth>lantern.navyctr[i][1]))
                  {
                       if(i==select)
                       {
                            document.getelementbyid("lanternn"+i).style.width=(document.getelementbyid("lanternn"+i).offsetwidth+lantern.navyctr[i][2]-34)+"px";  
                       }
                       else
                       {
                            document.getelementbyid("lanternn"+i).style.width=(document.getelementbyid("lanternn"+i).offsetwidth+lantern.navyctr[i][2])+"px";  
                       }
                          
                  }
                  else
                  {
                      if(i==select)
                      {
                           for(var j=0;j<lantern.info.length;j++)
                           {
                                document.getelementbyid("lanternn"+j).style.width=lantern.navyctr[j][1]+"px"; 
                           }
                           if(isie())
                                document.getelementbyid("lanternpoint").style.left=(document.getelementbyid("lanternn"+select).offsetleft+10)+"px";
                           else
                                document.getelementbyid("lanternpoint").style.left=(document.getelementbyid("lanternn"+select).offsetleft-document.getelementbyid("lantern").offsetleft+10)+"px";
                           lantern.navymoveover=true;
                           break;
                  }
              }
               if(i==select)
               {
                
                   if(isie())
                        document.getelementbyid("lanternpoint").style.left=(document.getelementbyid("lanternn"+select).offsetleft+10)+"px";
                   else
                        document.getelementbyid("lanternpoint").style.left=(document.getelementbyid("lanternn"+select).offsetleft-document.getelementbyid("lantern").offsetleft+10)+"px";
               }
            }
    },
    
     moveimg:function(i){
            if(document.getelementbyid("lanternimg"+i).offsetleft>0)
            {
               document.getelementbyid("lanternimg"+i).style.left=(document.getelementbyid("lanternimg"+i).offsetleft-lantern.picmovespeed)+"px";
            }
            else
            {
                document.getelementbyid("lanternimg"+i).style.left="0px";
                document.getelementbyid("lanternimg"+lantern.shownum).style.left=lantern.width+"px";
                lantern.imgmoveover=true;
            }
    },
    
      flashimg:function(i){
             document.getelementbyid("lanternimg"+i).style.opacity="100"; 
                    lantern.shownum=i;
                    lantern.imgmoveover=false;
                    lantern.navymoveover=false;
                    lantern.opacitynum=101;
                    lantern.cycnum=i;
                    clearinterval(lantern.ointerval);
                    lantern.otimeout=settimeout("lantern.otimeout=lantern.cyclantern()",lantern.timeout_time);
                    lantern.onchange=false;
    },
      
    cyclantern:function(){
        if(!lantern.onchange)
        {
            lantern.onchange=true;
            if(lantern.cycnum==lantern.info.length-1)
                lantern.cycnum=0;
            else
                lantern.cycnum++;
           lantern.setnavy(lantern.cycnum)
        }
    }
    
}