<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<input type=button onclick="check()">
<script>
function check(){
var sels=document.getElementsByName("sel");
for(i=0;i<sels.length-1;i++)
for(j=i+1;j<sels.length;j++)
if(sels[i].value==sels[j].value){alert();return;}
}
</script>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<input type=button onclick="check()">
<script>
function check(){
var sels=document.getElementsByName("sel");
for(i=0;i<sels.length-1;i++)
for(j=i+1;j<sels.length;j++)
if(sels[i].value==sels[j].value){alert();return;}
}
</script>
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<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name=sel>
<option value="">Please select</option>
</select>
<select name=sel>
<option value="">Please select</option>
</select><input type=button onclick="check()" value="check">
<script>
function check(){
var sels=document.getElementsByName("sel");
for(i=0;i<sels.length-1;i++)
for(j=i+1;j<sels.length;j++)
if(sels[i].value==sels[j].value&&sels[i]!=""&&sels[j]!=""){alert("The sequence is duplicate!");return;}
}
</script>