Jquery co dělá ,tahle seo funkce s netypickými znaky

<![CDATA[
        <script type="text/javascript">
          $(document).ready(function(){
          
          var keyword = $("input[name=keyword]");
          if(!keyword.val())
          {
            $("input[name^='product_description'],input[name^='category_description'],input[name='name'],input[name^='information_description'],input[name^='model']").keyup(function()
            {
              var SEOlink = $("input[name^='product_description'],input[name^='category_description'],input[name='name'],input[name^='information_description']").val();
              
              // var SEOlink = $(this).val();
                SEOlink = SEOlink.replace(/^\s+|\s+$/g, '');             // trim
                SEOlink = SEOlink.toLowerCase();                        // remove accents, swap, etc
              var from = "ảãạàáäâấầậẩẫẻẹẽèéëêềếệểễăắằẳẵặìíïîịơởỡợờớọõỏòóöôốộồổỗđưứừựửữùúüûủụùúũñcçčlľštžýnrrdçõã·/_,:;";
              var to   = "aaaaaaaaaaaaeeeeeeeeeeeeaaaaaaiiiiiooooooooooooooooooduuuuuuuuuuuuuuuncccllstzynrrdcoa------";
              
              for (var i=0, l=from.length ; i<l ; i++)
              {
                SEOlink = SEOlink.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
              }
              
              SEOlink = SEOlink.replace(/[^a-z0-9( -]/g, '')     // remove invalid chars
              .replace(/\(/g,"-")                                 // replace ( 
              .replace(/\s+/g, '-')                             // collapse whitespace and replace by -
              .replace(/-+/g, '-');                             // collapse dashes
              // return SEOlink;
              
              // model
              if ($("input[name^='model']").length){

                var model = $("input[name^='model']").val();
                  model = model.replace('.html'); // trim
                  model = model.toLowerCase();

                for (var i=0, l=from.length ; i<l ; i++) 
                {
                  model = model.replace('.html');
                }
                model = model.replace(/[^a-z0-9 -]/g, '')     // remove invalid chars
                .replace(/\s+/g, '-')                         // collapse whitespace and replace by -
                .replace(/-+/g, '-');                         // collapse dashes
                // return model;
              }
              // end model
              
              if (model) 
              {
                keyword.val(SEOlink+'.html');
              } else 
              {
                keyword.val(SEOlink+'.html');
              }
            });
          }
        });
          </script>
        ]]>

var to   = "aaaaaaaaaaaaeeeeeeeeeeeeaaaaaaiiiiiooooooooooooooooooduuuuuuuuuuuuuuuncccllstzynrrdcoa------";