<script language=javascript> ie4=(document.all)?true:false; ns4=(document.layers)?true:false; function toExit(){ var args=toExit.arguments; var visible=args[0]; if(ns4){ theObj=eval("document.layers[\'"+args[1]+"\']"); if(theObj)theObj.visibility=visible; } else if(ie4){ if(visible=='show')visible='visible'; if(visible=='hide')visible='hidden'; theObj=eval("document.all[\'"+args[1]+"\']"); if(theObj)theObj.style.visibility=visible; } } </script> 打开隐藏层