function updateURLParameter(url, param, paramVal)
{
    var TheAnchor = null;
    var newAdditionalURL = "";
    var tempArray = url.split("?");
    var baseURL = tempArray[0];
    var additionalURL = tempArray[1];
    var temp = "";

    if (additionalURL) 
    {
        var tmpAnchor = additionalURL.split("#");
        var TheParams = tmpAnchor[0];
            TheAnchor = tmpAnchor[1];
        if(TheAnchor)
            additionalURL = TheParams;

        tempArray = additionalURL.split("&");

        for (var i=0; i<tempArray.length; i++)
        {
            if(tempArray[i].split('=')[0] != param)
            {
                if(tempArray[i].split('=')[0] != "rel_fg")
                {
                    newAdditionalURL += temp + tempArray[i];
                    temp = "&";
                }
            }
        }        
    }
    else
    {
        var tmpAnchor = baseURL.split("#");
        var TheParams = tmpAnchor[0];
            TheAnchor  = tmpAnchor[1];

        if(TheParams)
            baseURL = TheParams;
    }

    if(TheAnchor)
        paramVal += "#" + TheAnchor;

    var rows_txt = temp + "" + param + "=" + paramVal;
    return baseURL + "?" + newAdditionalURL + rows_txt;
}
 
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        <h5 class="relatedTitle ><ul class="list-inline mb-1""> <li class="list-inline-item">Forse cercavi</li></ul></h5>\
    </div>\
    ');document.write('<div class=" col-sm  col-12 widget_filter"><ul style=" " class="list-unstyled">');document.write('<li class=" mb-2 bg-white"> \
                      <a class="btn btn-link btn-block btn-box-bordered  " rel="nofollow" href="'+updateURLParameter(window.location.href, 's', '1155+Mini+Itx+Motherboard')+'"> \
                        <div class="row  pb-1 pt-1"> \
                        <div class="col-sm col text-left"> 1155 Mini Itx Motherboard</div>\
                        <div class="col-sm-auto col-auto text-grey"> <img src="/img/chevron-right.svg" class="img-fluid img-responsive" /> </div>\
                        </div>\
                      </a> \
                </li>');
document.write("</ul></div>");
document.write(" </div> ");