下拉列表自动跳转

<select name="d_id"　 onChange="var jmpURL=this.options[this.selectedIndex].value ; if(jmpURL!='') {window.location=jmpURL;} else {this.selectedIndex=0 ;}">
<option value="productkind.jsp?tid=0">全部</option>
<%
ArrayList li=company.getAllPK(0);
for(Iterator it=li.iterator();it.hasNext();){
pkind=(pduKind)it.next();
int idt=pkind.getId();
%>
<option value="productkind.jsp?tid=<%=idt%>"　<% if(idt==tid) {%>
selected
<%}%> >
<%=pkind.getKindname() %>

</option>
<%
}
%>

</select>