////图层位置 
  function   sc2(){   
  document.getElementById("Div2").style.top=document.body.scrollTop+(document.body.clientHeight-document.getElementById("Div2").offsetHeight)/2   
  document.getElementById("Div2").style.left=document.body.scrollLeft+(document.body.clientWidth-document.getElementById("Div2").offsetWidth)/2;   
  }   
  function   sc3(){   
  document.getElementById("bigmap").style.top=document.body.scrollTop+(document.body.clientHeight-document.getElementById("bigmap").offsetHeight)/2   
  document.getElementById("bigmap").style.left=document.body.scrollLeft+(document.body.clientWidth-document.getElementById("bigmap").offsetWidth)/2;   
  }   
    function   scall(){   
  sc2() ; sc3() 
  }    
  window.onscroll=scall;   
  window.onresize=scall;   
  window.onload=scall;  
 /////bigmap
     IEvar=navigator.appVersion.substring(navigator.appVersion.indexOf('MSIE')+5,navigator.appVersion.indexOf(';',17));  
	  function   show(url)   
  {   
  image1.src   =   url;   
  }