function change(a,imgsrc)
{
var c;
c=a.id;
switch (c){
case "one0":
if (chaa.style.display =="")
{chaa.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif";  
a.title="请展开！";
}
else
{chaa.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
 a.title="请缩回！";
}
break;
case "one1":
if (chaa1.style.display =="")
{
chaa1.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif" ;
a.title="请展开！";
}
else
{chaa1.style.display ="";
 a.background=imgsrc+"XPTOP22.gif";
 a.title="请缩回！";
}
break;
case "one2":
if (chaa2.style.display =="")
{chaa2.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif"; 
a.title="请展开！";
}
else
{chaa2.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
 a.title="请缩回！";
}
break;
case "one3":
if (chaa3.style.display =="")
{chaa3.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif"; 
a.title="请展开！";
}
else
{chaa3.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
 a.title="请缩回！";
}
break;
case "one4":
if (chaa4.style.display =="")
{chaa4.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif";  
a.title="请展开！";
}
else
{chaa4.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
 a.title="请缩回！";
}
break;
case "one5":
if (chaa5.style.display =="")
{chaa5.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif";  
a.title="请展开！";
}
else
{chaa5.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
a.title="请缩回！";
}
break;
case "one6":
if (chaa6.style.display =="")
{chaa6.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif"; 
a.title="请展开！";
}
else
{chaa6.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
 a.title="请缩回！";
}
break;
case "one7":
if (chaa7.style.display =="")
{chaa7.style.display ="none";
a.background=imgsrc+"mback_up.gif"; 
a.title="请展开！";
}
else
{chaa7.style.display ="";
 a.background=imgsrc+"mback.gif"; 
 a.title="请缩回！";
}
break;
case "one8":
if (chaa8.style.display =="")
{chaa8.style.display ="none";
a.background=imgsrc+"mback_up.gif"; 
a.title="请展开！";
}
else
{chaa8.style.display ="";
 a.background=imgsrc+"mback.gif"; 
 a.title="请缩回！";
}
break;
case "one9":
if (chaa9.style.display =="")
{chaa9.style.display ="none";
a.background=imgsrc+"mback_up.gif"; 
a.title="请展开！";
}
else
{chaa9.style.display ="";
 a.background=imgsrc+"mback.gif"; 
 a.title="请缩回！";
}
break;
case "one10":
if (chaa10.style.display =="")
{chaa10.style.display ="none";
a.background=imgsrc+"mback_up.gif"; 
a.title="请展开！";
}
else
{chaa10.style.display ="";
 a.background=imgsrc+"mback.gif"; 
 a.title="请缩回！";
}
break;
case "one11":
if (chaa11.style.display =="")
{chaa11.style.display ="none";
a.background=imgsrc+"XPTOP22up.gif"; 
a.title="请展开！";
}
else
{chaa11.style.display ="";
 a.background=imgsrc+"XPTOP22.gif"; 
 a.title="请缩回！";
}
break;
}
}