php文件里写的JavaScript语句是不是可以直接剪切到外部js中然后调用啊

php文件里写的JavaScript语句是不是可以直接剪切到外部js中然后调用啊  例如php里的<SCRIPT language=javascript type=text/javascript>
var MiniSite=new Object();
MiniSite.Browser={
ie:/msie/.test(window.navigator.userAgent.toLowerCase()),
moz:/gecko/.test(window.navigator.userAgent.toLowerCase()),
opera:/opera/.test(window.navigator.userAgent.toLowerCase()),
safari:/safari/.test(window.navigator.userAgent.toLowerCase())
};
MiniSite.$=function(s){
return(typeof s=='object')?s:document.getElementById(s);
};
MiniSite.JsLoader={
load:function(sUrl,fCallback){
var _script=document.createElement('script');
_script.setAttribute('charset','gb2312');
_script.setAttribute('type','text/javascript');
_script.setAttribute('src',sUrl);
document.getElementsByTagName('head')[0].appendChild(_script);
if(MiniSite.Browser.ie){
_script.onreadystatechange=function(){
if(this.readyState=='loaded'||this.readyStaate=='complete'){
fCallback();
}
};
}else if(MiniSite.Browser.moz){
_script.onload=function(){
fCallback();
};
}else{
fCallback();
}
}
};
MiniSite.Cookie={
set:function(name,value,expires,path,domain){
if(typeof expires=="undefined"){
expires=new Date(new Date().getTime()+10*24*3600*1000);
}
document.cookie=name+"="+escape(value)+((expires)?"; expires="+expires.toGMTString():"")+((path)?"; path="+path:"; path=/")+((domain)?";domain="+domain:"");
},
get:function(name){
var arr=document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr!=null){
return unescape(arr[2]);
}
return null;
},
clear:function(name,path,domain){
if(this.get(name)){
document.cookie=name+"="+((path)?"; path="+path:"; path=/")+((domain)?"; domain="+domain:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT";
}
}
};
function loadJS(url,load)
{
var _script = document.createElement('script');
_script.setAttribute('type','text/javascript');
_script.setAttribute('src',url);
document.getElementsByTagName('head')[0].appendChild(_script);
if(!load) return;
if(document.all){
_script.onreadystatechange = function(){
if (this.readyState=='loaded' || this.readyState=='complete')
{
load();
}
};
}else{
_script.onload = function(){
load();
};
}
}</SCRIPT>可不可以把<SCRIPT language=javascript type=text/javascript>   </SCRIPT>去掉然后新建一个js文件把它粘贴在里面  php里用<script type="text/javascript" src="xxxx.js"></script>调用啊