şunu da deneyebilirsiniz.
body tagları arasına:
--------------------------------
<form name="doublecombo">
<p><select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
<option>Kategoriler</option>
<option>Web Tasarýmý Siteleri</option>
<option>Grafik Dersi Siteleri</option>
<option>JavaScript Örnekleri</option>
</select>
<select name="stage2" size="1">
<option value="#">Linkler</option>
</select>
<input type="button" name="test" value="Git!"
onClick="go()">
</p>
<script>
var groups=document.doublecombo.example.options.length
var group=new Array(groups)
for (i=0; i<groups; i++)
group[i]=new Array()
group[0][0]=new Option("Linkler","#")
group[1][0]=new Option("Tasaryum","http://www.tasaryum.com")
group[1][1]=new Option("E-Dersane","http://www.e-dersane.com")
group[1][2]=new Option("Web Teknikleri","http://www.webteknikleri.com")
group[1][3]=new Option("NetOkul","http://www.netokul.org")
group[2][0]=new Option("Web Dersleri","http://www.webdersleri.com")
group[2][1]=new Option("Aey Studio","http://www.aeystudio.com")
group[2][2]=new Option("Gfx Design","http://www.gfx-design.net")
group[2][3]=new Option("BimMag Photoshop","http://bimmag.sdu.edu.tr")
group[3][0]=new Option("JavaFile","http://www.javafile.com")
group[3][1]=new Option("Internet.com","http://www.javascript.internet.com")
group[3][2]=new Option("Dynamic Drive","http://www.dynamicdrive.com")
var temp=document.doublecombo.stage2
function redirect(x){
for (m=temp.options.length-1;m>0;m--)
temp.options[m]=null
for (i=0;i<group[x].length;i++){
temp.options[i]=new Option(group[x][i].text,group[x][i].value)
}
temp.options[0].selected=true
}
function go(){
location=temp.options[temp.selectedIndex].value
}
//-->
</script>
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kolay gelsin