The code works fine when links are images. But I have a problem when there are flash movies. Another page opens with undefined in the address bar when it needs to copy the link id to imagesID input box.

<script type="text/javascript">
var $input = $("#imagesID"); // <-- your input field

$('a.thumb').click(function() {
    var value = $input.val();
    var id = $(this).attr('id');
    if (value.match(id)) {
        value = value.replace(id + ';', '');
    }
    else {
        value += id + ';';
    }
    $input.val(value);
});
</script>
  <ul class="thumbs">
    <li>
        <a class="thumb" id="62">
            <img src="/FLPM/media/images/2A9L1V2X_sm.jpg" alt="Dock" id="62" class="floatLeft" />
        </a>
            <br />

        <a href="?Process=&IMAGEID=62" class="thumb"><span class="floatLeft">DELETE</span></a>
    </li>

    <li>
        <a class="thumb" id="61">
            <img src="/FLPM/media/images/0E7Q9Z0C_sm.jpg" alt="Desert Landscape" id="61" class="floatLeft" />
        </a>
            <br />
        <a href="?Process=&IMAGEID=61" class="thumb"><span class="floatLeft">DELETE</span></a>

    </li>

    <li>
        <a class="thumb" id="60">
            <img src="/FLPM/media/images/8R5D7M8O_sm.jpg" alt="Creek" id="60" class="floatLeft" />
        </a>
            <br />
        <a href="?Process=&IMAGEID=60" class="thumb"><span class="floatLeft">DELETE</span></a>
    </li>
    <li>
        <a class="thumb" id="59">
            <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://active.macromedia.com/flash4/cabs/swflash.cab#version=4,0,0,0" id="59" width="150" height="100" style="float:left; border:5px solid #CCCCCC; margin:5px 10px 10px 0;">
                <param name="scale" value="exactfit">
                <param name="AllowScriptAccess" value="always" />
                <embed name="name" src="http://www.refinethetaste.com/FLPM/media/flashes/7P4A6K7M.swf"
                quality="high" scale="exactfit" width="150" height="100"
                type="application/x-shockwave-flash"
                AllowScriptAccess="always"
                pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?
                P1_Prod_Version=ShockwaveFlash">
                </embed>
            </object> 
        </a>

            <br />
        <a href="?Process=&IMAGEID=59" class="thumb"><span class="floatLeft">DELETE</span></a>
    </li>
</ul>