Hi, Im working in visualforce right now, and I am adding a javascript code that should work like this.

http://jsfiddle.net/k5hkR/

However, it isnt working as I want it, any help on this?

Thank you,
 

<apex:page controller="ContactSearchController2" sidebar="false">

  <apex:form >
  <apex:pageMessages id="errors" />

  <apex:pageBlock title="Find Me A Customer!" mode="edit">

  <table width="100%" border="0">
  <tr>  
    <td width="200" valign="top">

      <apex:pageBlock title="Parameters" mode="edit" id="criteria">

      <script type="text/javascript">
      function doSearch() {
        searchServer(
          document.getElementById("firstName").value,
          document.getElementById("lastName").value,
          document.getElementById("accountName").value,
          document.getElementById("technology").value
          );
          var $rows = $("tr");

          $("doSearch();").keyup(function() {
    var val = $.trim(this.value);
    if (val === "")
        $rows.show();
    else {
        $rows.hide();
        $rows.has("td:contains(" + accountName + ")").show();
    }
});

      }
      </script> 

      <apex:actionFunction name="searchServer" action="{!runSearch}" rerender="results,debug,errors">
          <apex:param name="firstName" value="" />
          <apex:param name="lastName" value="" />
          <apex:param name="accountName" value="" />
          <apex:param name="technology" value="" />
      </apex:actionFunction>

      <table cellpadding="2" cellspacing="2">
      <tr>
        <td style="font-weight:bold;">First Name<br/>
        <input type="text" id="firstName" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Last Name<br/>
        <input type="text" id="lastName" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Account<br/>
        <input type="text" id="accountName" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Interested Technologies<br/>
          <select id="technology" onchange="doSearch();">
            <option value=""></option>
            <apex:repeat value="{!technologies}" var="tech">
              <option value="{!tech}">{!tech}</option>
            </apex:repeat>
          </select>
        </td>
      </tr>
      </table>

      </apex:pageBlock>

    </td>
    <td valign="top">

    <apex:pageBlock mode="edit" id="results">

        <apex:pageBlockTable value="{!contacts}" var="contact">

            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="First Name" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="firstName" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!contact.firstName}"/>
            </apex:column>

            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Last Name" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="lastName" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!contact.lastName}"/>
            </apex:column>

            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Account" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="account.name" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!contact.account.name}"/>
            </apex:column>

            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Technologies" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="interested_technologies__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!contact.Interested_Technologies__c}"/>
            </apex:column>

        </apex:pageBlockTable>

    </apex:pageBlock>

    </td>
  </tr>
  </table>

  <apex:pageBlock title="Debug - SOQL" id="debug">
      <apex:outputText value="{!debugSoql}" />           
  </apex:pageBlock>    

  </apex:pageBlock>

  </apex:form>

</apex:page>