$(function(){

        var st=document.createElement("style");

        document.head.appendChild(st);

        var sty={}, s;

        var A={}, cou=1;

        $("#sortable .content").each(function(i, c){

             if(!sty[c.innerHTML]){

                sty[c.innerHTML]=1;

                A[c.innerHTML]=cou++;

             }else sty[c.innerHTML]+=1;

             c.setAttribute("data-w", A[c.innerHTML]);

        });

        for(s in sty){

            if(sty[s]>1){

                st.sheet.insertRule("#sortable .content[data-w='"+A[s]+"']{background-color:rgb("+

                    parseInt(Math.random()*256)+","+ 

                    parseInt(Math.random()*256)+","+

                    parseInt(Math.random()*256)+

                ");}", 0);

            };

        };

    });