How can I make my drop-down list validation code to work?

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Javascript

HTML

validation

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I'm new to JavaScript and need your help. I created a HTML form and tried to validate each input field using JavaScript.

Here is a scenario:
When I entered a value for city, then hit the enter key; cursor jumped to state field. I selected a state; hit the enter key; cursor didn't jump to zip code field. So I pressed TAB key, cursor jumped to ZIP Code field. I entered a value for ZIP Code; hit the enter key; it sent alert message, “Please select a state".If I continued to press TAB Key, I was able to enter value for the remaining fields. But when I clicked Submit button, it sent alert message, "Please select a state". It seemed that the system didn't recognize that a value in the state field was selected. Without form validation, the form works just fine.

I compared the drop-down list validation code posted in this website with my code; I couldn't figure out why my code didn't work. I'm stuck!! Your help is greatly appreciated.

PennyC

Here is my validation code:

//check option
function isOption(elm){
   var ddl=document.getElementById("elm");
  if (ddl == null) return false;
  else return true;
}


if (isOption(form.selstate)==false)
 {
  alert("Please select a state.");
  form.selstate.focus();
  return false;
  }

Here is my form:

<form action="_gdForm/webformmailer.asp" method="post"  önSubmit="return 
isReady(this)" name="myform">
.....


<td align="right">
<font face="arial" size="2">State/Prov</font></td>
<td align="left"> 
    <select name="state" size="1" id="selstate" /> 
 
        <option value="-1" selected>  </option> 
        <option value="1">BC</option> 
        <option value="2">CT</option> 
        <option value="3">DE</option> 
        <option value="4">FL</option> 
        <option value="5">MA</option> 
        <option value="6">MD</option> 
        <option value="7">NH</option>   
        <option value="8">NJ</option>  
        <option value="9">NY</option>      
        <option value="10">OH</option> 
        <option value="11">ON</option> 
        <option value="12">Other</option>    
        <option value="13">PA</option> 
        <option value="14">QC</option> 
        <option value="15">RI</option> 
        <option value="16">TX</option> 
        <option value="17">VA</option> 
        <option value="18">VT</option> 
        <option value="19">WV</option>     
     </select>   

</td>

.......

</form>