function FindDotNetControl(strName, strType)
{
    var objInputs = document.getElementsByTagName(strType);
    for (i=0;i<objInputs.length;i++)
    {
        if (objInputs[i].id.indexOf(strName)>=0)
        {
            return objInputs[i];
            break;
        }
    }
}

function submitRegTransfer()
{
    var txtCriteria = FindDotNetControl('criteria', 'input');
    var URL = "http://www.regtransfers.co.uk/numberplates/registrations/searchresults.asp?affcode=motorstoday&searchtype=general&criteria=" + txtCriteria.value;
    document.location = URL
    
}