<form id="form1" name="form1" method="post">
        Search Type:
          <label>
            <input name="SearchTypeSelect" type="radio" id="SearchTypeSelect_0" onlick="showComputerForm()" value="computer"/>
          Computers</label>
        <label>
          <input type="radio" name="SearchTypeSelect" value="license" onclick="license()" id="SearchTypeSelect_1"/>
          Licenses</label>
      </form>

jscript:

function license() {
    document.getElementById("formLicense").style.visibility = "visible";
    document.getElementById("formComputer").style.visibility = "hidden";
    populate();
}
function showComputerForm() {
    document.getElementById("formComputer").style.visibility = "visible";
    document.getElementById("formLicense").style.visibility = "hidden";
    alert("ok");
}