<select name="v7" id="v7" onchange="alert(this.options[this.selectedIndex].value)">
<option value="0" selected>无标示</option>
<option value="1">符号标示</option>
<option value="2">图片标示</option>
</select>
<option value="0" selected>无标示</option>
<option value="1">符号标示</option>
<option value="2">图片标示</option>
</select>
<select name="v7" id="v7" onchange='tr_display(this,"0");'>
<option value="0" selected>无标示</option>
<option value="1">符号标示</option>
<option value="2">图片标示</option>
</select>
<div id="a" style="display:none">0</div>
<div id="b" style="display:none">1</div>
<div id="c" style="display:none">2</div>
<SCRIPT language=javascript type=text/javascript>
function tr_display(obj,type){
var bb,aa;
bb=obj.options[obj.selectedIndex].value;
aa=type;
alert(bb);
if(aa == '0'){
a.style.display = 'none';
b.style.display = 'block';
c.style.display = 'block';
}
else if{aa == "1"
a.style.display = 'block';
b.style.display = 'none';
c.style.display = 'block';
}
else if{aa == "2"
a.style.display = 'block';
b.style.display = 'block';
c.style.display = 'none';
}
}
</SCRIPT>