function getObject(objectId) {

if(document.getElementById && document.getElementById(objectId)) {

return document.getElementById(objectId);

} else if (document.all && document.all(objectId)) {

return document.all(objectId);

} else if (document.layers && document.layers[objectId]) {

return document.layers[objectId];

} else {

return false;

}
}


<!----??????????????????----->



function focusTab(n){

var bg1="url(http://www.cctd.com.cn/images/index43.gif)";
var bg2="url(http://www.cctd.com.cn/images/index44.gif)";
for(var i=1;i<=5;i++){

if (i==n){
getObject('focusTab'+i).style.background=bg1;
getObject('focusTable'+i).style.display='';
}
else {
getObject('focusTab'+i).style.background=bg2;
getObject('focusTable'+i).style.display='none';
}
}
}



<!------????????????????????.....------->

function focusCab(n){

var by1="url(http://www.cctd.com.cn/images/index78.gif)";
var by2="url(http://www.cctd.com.cn/images/index79.gif)";
for(var i=1;i<=5;i++){

if (i==n){
getObject('focusCab'+i).style.background=by1;
getObject('focusCable'+i).style.display='';
}
else {

getObject('focusCab'+i).style.background=by2;
getObject('focusCable'+i).style.display='none';

}
}
}



<!------????????....------->

function focusBab(n){

var bb1="";
var bb2="";

for(var i=1;i<=4;i++){

if (i==n){

getObject('focusBab'+i).style.background=bb1;
getObject('focusBable'+i).style.display='';
}
else {

getObject('focusBab'+i).style.background=bb2;
getObject('focusBable'+i).style.display='none';
}
}
}

<!------????????????.....------->

function focusDab(n){

var bd1="url(http://www.cctd.com.cn/jsp/channel/2007img/kf32.gif)";
var bd2="url(http://www.cctd.com.cn/jsp/channel/2007img/kf31.gif)";

for(var i=1;i<=2;i++){
if (i==n){

getObject('focusDab'+i).style.background=bd1;
getObject('focusDable'+i).style.display='';
}
else {
getObject('focusDab'+i).style.background=bd2;
getObject('focusDable'+i).style.display='none';
}
}
}	





<!------????????....------->

function focusDaba(n){

var bb1="";
var bb2="";

for(var i=1;i<=4;i++){

if (i==n){

getObject('focusDaba'+i).style.background=bb1;
getObject('focusCabale'+i).style.display='';
}
else {

getObject('focusDaba'+i).style.background=bb2;
getObject('focusCabale'+i).style.display='none';

}
}
}

<!------????????????????------->

function focusFab(n){

var aa1="";
var aa2="";

for(var i=1;i<=5;i++){

if (i==n){

getObject('focusFab'+i).style.background=aa1;
getObject('focusFable'+i).style.display='';
}
else {
getObject('focusFab'+i).style.background=aa2;
getObject('focusFable'+i).style.display='none';

}
}
}