function fun17(){
if(document.getElementById("atc_desc1").value != ''){
for(i=2;i<3;i++){
var a=eval("document.form_MAIN.atc_desc"+i).value;
alert(a);
if(document.getElementById("atc_desc1").value == a){
alert('Err');
}
}
}
}<select name="atc_desc1" id="atc_desc1">
<option value="">请选择</option>
<option value="8">灰绿d</option>
<option value="7">土黄</option>
<option value="6">蓝</option>
<option value="5">红色</option>
<option value="4">黑</option>
</select>
<select name="atc_desc2" id="atc_desc2">
<option value="">请选择</option>
<option value="8">灰绿d</option>
<option value="7">土黄</option>
<option value="6">蓝</option>
<option value="5">红色</option>
<option value="4">黑</option>
</select>
<input type="button" value="17" onclick="fun17()"/>
if(document.getElementById("atc_desc1").value != ''){
for(i=2;i<3;i++){
var a=eval("document.form_MAIN.atc_desc"+i).value;
alert(a);
if(document.getElementById("atc_desc1").value == a){
alert('Err');
}
}
}
}<select name="atc_desc1" id="atc_desc1">
<option value="">请选择</option>
<option value="8">灰绿d</option>
<option value="7">土黄</option>
<option value="6">蓝</option>
<option value="5">红色</option>
<option value="4">黑</option>
</select>
<select name="atc_desc2" id="atc_desc2">
<option value="">请选择</option>
<option value="8">灰绿d</option>
<option value="7">土黄</option>
<option value="6">蓝</option>
<option value="5">红色</option>
<option value="4">黑</option>
</select>
<input type="button" value="17" onclick="fun17()"/>
var sleArray=new Array();
var i=0;
</script>
<script for="atc_desc" event="onchange"> sled=true;
if(event.srcElement.tagName=="SELECT" && event.srcElement.value!=""){
var sleValue=event.srcElement.value;
for(j=0;j<sleArray.length;j++){
if(sleArray[j]==sleValue){
alert('不能再选');
sled=false;
break;
}
else{
sled=true;
}
}
if(sled){
sleArray[i++]=sleValue;
}
}</script>
<BODY>
<form name="form1" method="post" action="">
<select name="atc_desc">
<option value="">请选择</option>
<option value="8">灰绿d</option>
<option value="7">土黄</option>
<option value="6">蓝</option>
<option value="5">红色</option>
<option value="4">黑</option>
</select>
<select name="atc_desc">
<option value="">请选择</option>
<option value="8">灰绿d</option>
<option value="7">土黄</option>
<option value="6">蓝</option>
<option value="5">红色</option>
<option value="4">黑</option>
</select>
<select name="atc_desc">
...
</select>
...
<select name="atc_desc">
...
</select>
<input type="submit" name="Submit" value="提交">
</form></BODY>