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";
}
}
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";
}
}
<frameset rows="50,*" border="0" >
<frame name="header" src="header.html" marginwidth="15" marginheight="15" scrolling="no" frameborder="0" noresize> </frame>
<frameset cols="30%,*" border="0">
<frame src="tree.html" name="tree" id="tree" scrolling="Auto" frameborder="1" marginwidth="0" marginheight="0">
<frame name="frameset" id="frameset" frameborder="1" scrolling="auto">
</frameset> </frameset>
</form>