不少朋友通过各种方式问我要Blog顶部的滚动导航菜单的代码。其实也没什么特别的，但既然有需求，我就还是把这部分代码整理出来，供大家参考。
复制代码 代码如下:
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://pat"){
//forlooser.dtd
g_myBodyInstance=document.documentElement;
g_myBodyInstanceString="document.documentElement";
}
varisMinNS4=(navigator.appName.indexOf("Netscape")>=0&&
parseFloat(navigator.appVersion)>=4)?1:0;
varisMinNS5=(navigator.appName.indexOf("Netscape")>=0&&
parseFloat(navigator.appVersion)>=5)?1:0;
varisMinIE4=(document.all)?1:0;
varisMinIE5=(isMinIE4&&navigator.appVersion.indexOf("5.")>=0)?1:0;
varisMacIE=(isMinIE4&&navigator.userAgent.indexOf("Mac")>=0)?1:0;

vargetFFVersion=navigator.userAgent.substring(
navigator.userAgent.indexOf("Firefox")).split("/")[1];
//extraheightinpxtoaddtoiframeinFireFox1.0+browsers
varFFextraHeight=getFFVersion<1.5?16:0;


functiongetLayer(name){
if(isMinNS5)
returndocument.getElementById(name);
elseif(isMinIE4)
returneval('document.all.'+name);
elseif(isMinNS4)
returnfindLayer(name,document);

returnnull;
}

functionfindLayer(name,doc){

vari,layer;

for(i=0;i<doc.layers.length;i++){
layer=doc.layers[i];
if(layer.name==name)
returnlayer;
if(layer.document.layers.length>0){
layer=findLayer(name,layer.document);
if(layer!=null)
returnlayer;
}
}

returnnull;
}

functionmoveLayerTo(layer,x,y){
if(isMinIE4){
layer.style.left=x;
layer.style.top=y;
}
elseif(isMinNS5){
layer.style.left=x+'px';
layer.style.top=y+'px';
}
elseif(isMinNS4)
layer.moveTo(x,y);
}

functiongetPageLeft(layer){

if(isMinIE4||isMinNS5)
return(layer.offsetLeft);
elseif(isMinNS4)
return(layer.pageX);
return(-1);
}

functiongetPageTop(layer){

if(isMinIE4||isMinNS5)
return(layer.offsetTop);
elseif(isMinNS4)
return(layer.pageY);
return(-1);
}

functiongetPageScrollX(){

if(isMinIE4||isMinNS5)
return(g_myBodyInstance.scrollLeft);
elseif(isMinNS4)
return(window.pageXOffset);
return(-1);
}

functiongetPageScrollY(){

if(isMinIE4||isMinNS5)
return(g_myBodyInstance.scrollTop);
elseif(isMinNS4)
return(window.pageYOffset);
return(-1);
}

varg_p_zealNavigatorBar=null;
g_p_zealNavigatorBar=getLayer('zealNavigatorBar');
if(!isMinIE4){g_p_zealNavigatorBar.style.position='fixed';}
functionreposzealNavigatorBar(){
if(isMinIE4){
try{
moveLayerTo(g_p_zealNavigatorBar,
getPageLeft(g_p_zealNavigatorBar),
getPageScrollY());
}catch(e){}
}
}
window.onresize=reposzealNavigatorBar;
window.onscroll=reposzealNavigatorBar;
window.onload=reposzealNavigatorBar;
</script>
</BODY>
</HTML>