Chcia?bym zrobi?

Jest to mi bardzo potrzebne

<form name="doublecombo">
<p><select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
<option>Owoce</option>
<option>Warzywa</option>
<option>Samochody</option>
</select>
<select name="stage2" size="1">
<option>Jab?ka</option>
<option>Pomarancze</option>
<option>Czeresnie</option>
</select>



<script>
<!--

var groups=document.triplecombo.example.options.length
var group=new Array(groups)
for (i=0; i<groups; i++)
group[i]=new Array()

group[0][0]=new Option("Jab?ka")
group[0][1]=new Option("Pomara?cze")
group[0][2]=new Option("Czeresnie")

group[1][0]=new Option("Sa?ata")
group[1][1]=new Option("Ziemniaki")

group[2][0]=new Option("Audi")
group[2][1]=new Option("Nissan")
group[2][2]=new Option("Opel")
group[2][3]=new Option("Ford")

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>