javascript實現動態CSS換膚技術的指令碼

<SCRIPT LANGUAGE=javascript>
<!--
function SetCookie(name,value){
var argv=SetCookie.arguments;
var argc=SetCookie.arguments.length;
var expires=(2<argc)?argv[2]:null;
var path=(3<argc)?argv[3]:null;
var domain=(4<argc)?argv[4]:null;
var secure=(5<argc)?argv[5]:false;
document.cookie=name+"="+escape(value)+((expires==null)?"":("; expires="+expires.toGMTString()))+((path==null)?"":("; path="+path))+((domain==null)?"":("; domain="+domain))+((secure==true)?"; secure":"");
}

function GetCookie(Name) {
var search = Name + "=";
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search);
if (offset != -1) {
offset += search.length;
end = document.cookie.indexOf(";", offset);
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset,end));
}
}
return returnvalue;
}

var thisskin;
thisskin=GetCookie("nowskin");
if(thisskin!="")
skin.href=thisskin;
else
skin.href="css.css";

function changecss(url){
if(url!=""){
skin.href=url;
var expdate=new Date();
expdate.setTime(expdate.getTime()+(24*60*60*1000*30));
//expdate=null;
//以下設定COOKIES時間為1年,自己隨便設定該時間..
SetCookie("nowskin",url,expdate,"/",null,false);
}
}
//-->
</SCRIPT>
<P>請選擇下面的下拉式功能表測試換膚效果</P>

<a href=# onclick="changecss('css.css')">css.css</a>
<a href=# onclick="changecss('css1.css')">css1.css</a>
<a href=# onclick="changecss('css2.css')">css2.css</a>
<a href=# onclick="changecss('css3.css')">css3.css</a>
<br>

<select onchange="changecss(this.value)">
<option>選擇樣式單檔案</option>
<script language="javascript">
var csss=new Array();
csss[0]="css.css";
csss[1]="css1.css";
csss[2]="css2.css";
csss[3]="css3.css";
var i;
for(i=0;i<4;i++)
if(thisskin==csss[i])
document.write("<option value=\""+csss[i]+"\" selected>"+csss[i]+"樣式單檔案</option>");
else
document.write("<option value=\""+csss[i]+"\">"+csss[i]+"樣式單檔案</option>");
</script>
</select>