var   increaseFlag;     //标志是增大还是减小图片 
var   count;
var   t;
var   IntervalID;       //页面全局变量 
var   IntervalID1;
var   interval=50;       //变化频率，50毫秒改变一次大小 
var   divHeight=10;           //每一次增加或减小的高度 
var   maxHeight=500,minHeight=1; 

//在需要加载这个功能的处理函数中使用 

function  init(){ 
    document.getElementById("GuangGaoPic").style.display="block";
     document.getElementById("GuangGaoPic2").style.display="block";
	increaseFlag=true;
	count=0;
	InterValID=setInterval("changeImageSize()",interval); 
	} 
function StopImageSize(){
    if(count>=3)
    {
        clearInterval(IntervalID1);
        InterValID=setInterval("changeImageSize()",interval);
    }
    else
    {
        count++;
    }
}
function changeImageSize(){ 
          if(increaseFlag){ 
                    t=document.getElementById("GuangGao").style.pixelHeight;//
                     t2=document.getElementById("GuangGao2").style.pixelHeight;//
                    t1=document.getElementById("GuangGao").style.Height;
                     t1_2=document.getElementById("GuangGao2").style.Height;
                    if(t>=maxHeight){  
                              increaseFlag=false; 
                              clearInterval(InterValID);
                              IntervalID1=setInterval("StopImageSize()",1000);
                    } 
                    else{ 
                              document.getElementById("GuangGao").style.pixelHeight=document.getElementById("GuangGao").style.pixelHeight+divHeight;//
//                              document.getElementById("GuangGao").style.pixelwidth=maxWidth;
                  } 
                   if(t2>=maxHeight){  
                              increaseFlag=false; 
                              clearInterval(InterValID);
                              IntervalID1=setInterval("StopImageSize()",1000);
                    } 
                    else{ 
                              document.getElementById("GuangGao2").style.pixelHeight=document.getElementById("GuangGao2").style.pixelHeight+divHeight;//
//                              document.getElementById("GuangGao").style.pixelwidth=maxWidth;
                  } 
          } 
          else{ 
                    t=document.getElementById("GuangGao").style.pixelHeight;//
                     t2=document.getElementById("GuangGao2").style.pixelHeight;//
                    if(t <=minHeight){ 
                              clearInterval(InterValID);
                              document.getElementById("GuangGao").style.pixelHeight=0;//
                              document.getElementById("GuangGaoPic").style.display="none";
                               document.getElementById("GuangGaoPic2").style.display="none";
                              scall();//首页弹出框
                    } 
                    else{ 
                              document.getElementById("GuangGao").style.pixelHeight=t;
                              document.getElementById("GuangGao").style.pixelHeight=document.getElementById("GuangGao").style.pixelHeight-divHeight;//pixel
//                            document.getElementById("GuangGao").style.pixelwidth=maxWidth;
                   } 
                   if(t2 <=minHeight){ 
                              clearInterval(InterValID);
                              document.getElementById("GuangGao2").style.pixelHeight=0;//
                              document.getElementById("GuangGaoPic").style.display="none";
                               document.getElementById("GuangGaoPic2").style.display="none";
                              scall();//首页弹出框
                    } 
                    else{ 
                              document.getElementById("GuangGao2").style.pixelHeight=t;
                              document.getElementById("GuangGao2").style.pixelHeight=document.getElementById("GuangGao2").style.pixelHeight-divHeight;//pixel
//                            document.getElementById("GuangGao").style.pixelwidth=maxWidth;
                   } 
          } 
}
window.onload=init;