Here is my form code. I'm trying to create a lead record from the pre-chat form if one does not already exist.

<form method='post' id='prechatForm'>
    First Name:<font color="red">*</font><input type="text" name="liveagent.prechat:FirstName" /><br />
    Last Name:<font color="red">*</font> <input type="text" name="liveagent.prechat:LastName" /><br />
    Email:<font color="red">*</font> <input type="text" name="liveagent.prechat:Email" /><br />
    Phone Number:<font color="red">*</font> <input type='text' name='liveagent.prechat:Phone' /><br />
    Company Name:<font color="red">*</font> <input type='text' name='liveagent.prechat:Company' /><br />
    State:<font color="red">*</font> <select name="liveagent.prechat:State">
          <option value='Select State' selected='selected'>Select State</option>
          <option value='AK'>AK</option>
          <option value='AL'>AL</option>
          <option value='AR'>AR</option>
          <option value='AZ'>AZ</option><option value='CA'>CA</option><option value='CO'>CO</option><option value='CT'>CT</option><option value='DE'>DE</option><option value='FL'>FL</option><option value='GA'>GA</option><option value='HI'>HI</option><option value='IA'>IA</option><option value='ID'>ID</option><option value='IL'>IL</option><option value='IN'>IN</option><option value='KS'>KS</option><option value='KY'>KY</option><option value='LA'>LA</option><option value='MA'>MA</option><option value='MD'>MD</option><option value='ME'>ME</option><option value='MI'>MI</option><option value='MN'>MN</option><option value='MO'>MO</option><option value='MS'>MS</option><option value='MT'>MT</option><option value='NC'>NC</option><option value='ND'>ND</option><option value='NE'>NE</option><option value='NH'>NH</option><option value='NJ'>NJ</option><option value='NM'>NM</option><option value='NV'>NV</option><option value='NY'>NY</option><option value='OH'>OH</option><option value='OK'>OK</option><option value='OR'>OR</option><option value='PA'>PA</option><option value='RI'>RI</option><option value='SC'>SC</option><option value='SD'>SD</option><option value='TN'>TN</option><option value='TX'>TX</option><option value='UT'>UT</option><option value='VA'>VA</option><option value='VT'>VT</option><option value='WA'>WA</option><option value='WI'>WI</option><option value='WV'>WV</option><option value='WY'>WY</option>
        </select><br />
        <br/><font color="red">*</font>Indicates a required field.<br /><br />
        <!-- Saves values entered in the pre-chat fields to the chat transcript -->
        <input type="hidden" name="liveagent.prechat.save:FirstName" value="First_Name__c" />
        <input type="hidden" name="liveagent.prechat.save:LastName" value="Last_Name__c" />
        <input type="hidden" name="liveagent.prechat.save:Email" value="Email__c" />
        <input type="hidden" name="liveagent.prechat.save:Phone" value="Phone__c" />
        <input type="hidden" name="liveagent.prechat.save:Company" value="Company__c" />
        <input type="hidden" name="liveagent.prechat.save:State" value="State__c" />
       
<!-- Map lead fields  -->
<input type="hidden" name="liveagent.prechat.findorcreate.map:Lead" value="FirstName,FirstName;LastName,LastName;Email,Email;" />

<!-- Match lead by email -->
<input type="hidden" name="liveagent.prechat.findorcreate.map.doFind:Lead" value="Email,true;" />
<input type="hidden" name="liveagent.prechat.findorcreate.map.isExactMatch:Lead" value="Email,true;" />

<!-- Create unmatched lead -->
<input type="hidden" name="liveagent.prechat.findorcreate.map.doCreate:Lead" value="FirstName,true;LastName,true;Email,true;" />

<!-- Save lead to lookup -->
<input type="hidden" name="liveagent.prechat.findorcreate.saveToTranscript:Lead" value="Lead" />

<!-- Display lead -->
<input type="hidden" name="liveagent.prechat.findorcreate.showOnCreate:Lead" value="true" />

    <input type='submit' value='Request Chat' id='prechat_submit'/> 
</form>