javascript 网站常用的iframe分割

function switchSysBar(){
if (parent.document.getElementById('attachucp').cols=="160,10,*"){
document.getElementById('leftbar').style.display="";
parent.document.getElementById('attachucp').cols="0,10,*";
}
else{
parent.document.getElementById('attachucp').cols="160,10,*";
document.getElementById('leftbar').style.display="none"
}
}