function site_search()
{
    location.href = xGetElementById('server-path').value + "/About/SiteSearch&search-string=" + xGetElementById('search-string').value;
}

function validate_search(e)
{
    if( e.keyCode && e.keyCode == 13 )
    {
        site_search();
    }
}

function init_search_field()
{
    xAddEventListener('search-string','keyup',validate_search,true);
}

xAddEventListener(window,'load',init_search_field,true);